Lab on Aspirin Tablets Essay Example

Lab on Aspirin Tablets Essay This lab was basically about finding the percentage of acetylsalicylic acid in an aspirin tablet. First, the base was created, which was made out of 1. 00 g of NaOH and D-water. Then the buret was attached to the clamp on the ring stand and the base was poured into the buret. After that, one by one, an aspirin tablet was dropped into an Erlenmeyer flask filled with 50 mL of D-water so that it could become dissolved. After the tablet was completely dissolved, a few drops of phenol were added, and the base was added very slowly, changing the color of the mixture into a pink. The flask was to be swiveled around. This was done three times, trying to get the pink color to stay for at least two minutes. Materials: * D-water * Scale * Slop beaker * Erlenmeyer Flask x3 * Volumetric Flask * Ring Stand * Buret * Buret Clamp * Phenolphthalein * NaOH * Weighing boats * Aspirin Tablets x3 * Stirring Rod * Scoopula Purpose: The purpose of this lab was to find the percentage of acetylsalicylic acid in n aspirin tablet. Theory/Intro: Aspirin possesses a number of properties that make it the most recommended drug pretty often. It is an analgesic, which means that it is very effective in pain relief. Being an anti-inflammatory agent, it is also provides some relief from the swelling associated with arthritis and minor injuries. It also reduces fever because it is an antipyretic compound. More than 40 million poun ds of aspirin are produced in the U. S. every year. This rate breaks down to about 300 tablets per year for every woman, man, and child. We will write a custom essay sample on Lab on Aspirin Tablets specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Lab on Aspirin Tablets specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Lab on Aspirin Tablets specifically for you FOR ONLY $16.38 $13.9/page Hire Writer However, repeated use may cause gastrointestinal bleeding, and large doses can provoke a host of reactions including vomiting, diarrhea, vertigo, and hallucinations. The average dose is approximately 0. 3-1 g, but single doses of 10-30 g can be deadly. The most important compound in the synthesis of aspirin, salicylic acid, is prepared from phenol by a process discovered over 100 years ago by a German chemist Hermann Kolbe. Also known as acetylsalicylic acid, aspirin has a chemical formula of C9H8O4. Aspirin is sold over the counter and comes in many different forms. You can have white tablets to chewing gum and rectal suppositories. Also available are coated, chewable, buffered and extended release forms. Over the counter medicines like Alka-Seltzer Original Effervescent Antacid Pain Reliever, contains aspirin for pain relief. Aspirin belongs to a group of drugs called salicylates. Aspirin isn’t so easy on the stomach because it is quickly absorbed into the bloodstream and provides quick and relatively long-lasting pain relief. Aspirin also reduces inflammation. Researchers believe these effects come about because aspirin blocks the production of pain-producing chemicals which are called prostaglandins. While it does relieve pain and reduce inflammation, it also lowers fever by acting on the part of the brain that regulates temperature. The brain then sends signals to the blood vessels to widen, which allow any heat to leave the body more effectively. Procedures: 1. Make 100 mL of 0. 20M NaOH solution. 2. Find mass of one tablet. 3. Dissolve tablet in flask using, 50mL of D-water. Use a stirring rod to assist in crushing and dissolving the tablet. There should be some powdery substances on the bottom of the flask, it’s the starches put in the tablets. 4. While one partner is dissolving the tablet the other one should be setting up the buret and stand. Place the clamp on the stand. Next wash the buret with a little D-water before placing the buret on the clamp. Next fill the buret with NaOH solution up to a place above the â€Å"O† marking on the buret. Open the buret, to allow some of the base to run into a slop beaker thus filling the tip. Make sure the level of the liquid is now below the zero mark. Record the reading after filling the tip. 5. Add several drops of the indicator, phenolphthalein, to the flask. 6. Slowly add the base while swirling the flask. Continue add base until a faint pink color stays in flask. Record the value from the buret. Add a few drops more and see if the color stays and changes. You do not want a dark purple color. Record the final value of base needed. 7. Repeat the process for two more tablets, for three in total. Refill the buret after each trial. Drawing Observations: 1. The aspirin tablets were white. 2. The aspirin tablets had a smooth texture. 3. The aspirin tablets were odorless. 4. The NaOH was a frosted white color. 5. The NaOH was odorless. 6. The base was a clear color; no powdery substances were left behind. . When the NaOH was put in D-water it dissolved thoroughly leaving nothing behind. 8. When the aspirin tablets were put in D-water they took a while to dissolve. 9. When the aspirin tablets were finally dissolved, powdery substances were left behind. 10. When the base was mixed with the dissolved aspirin tablets nothing happened. 11. When the drops of phenol were added, then the mixture turn ed pink. 12. At first, the base was added to quickly so it turned into a dark pink, almost purple. 13. After swiveling the mixture a few times it would lose its pink coloring and turn back into a clear color. 4. At the second try, the base turned into a medium pink color. 15. It stood pink for a longer period of time, approximately 1 minute. 16. The mixtures for all three trials were odorless. 17. At the last try, the base was a light pink color, and it stayed for two minutes. 18. When too much base was added to the phenol/ dissolved aspirin, the mixture would turn into a dark pink. 19. When the base was added in slowly, the pink color lasted a longer time. 20. The faster the base was added, the darker the mixture got, and the longer it took to return to its original clear color. Conclusion: One source of error could’ve been that the NaOH solution that was poured into the buret wasn’t at the zero mark. This could have affected the end results because if it wasn’t at the zero mark that means that we had more liquid then needed, so when the base was poured into the phenol/dissolved aspirin mixture the recordings weren’t accurate. That means that the calculations were thrown off because the wrong amount was used. Another source of error could’ve been that when the 1. 00 g of NaOH was measured it wasn’t exact. The scale is very sensitive and maybe breathing could’ve affected the outcome. This affects our results because now there isn’t as much NaOH as there should be in the base, which could cause a difference when the aspirin and phenol are mixed with base. The color could’ve maybe stayed for longer. The last source of error could’ve been that the base was poured in too quickly from the buret, causing the color change to be off.

Neutrinos And Gamma Rays Essays - Neutrinos, Dark Matter

Neutrinos And Gamma Rays Essays - Neutrinos, Dark Matter Neutrinos and Gamma Rays Emission of a beta particle produces an energy change in the nucleus of an atom. The energy change that is observed, however, does not add up to satisfy the Law of Conservation of energy. The conservation law can be balanced if another particle, called the neutrino is part of this process. In the time it takes to read just this sentence, more than a billion of them will have passed unnoticed through the reader's body. Neutrinos may account for an appreciable portion of the mass of the universe, even tending to slow it's rate of expansion. Originally proposed in 1931 by Wolfgang Pauli to account for mass that was mysteriously lost from certain nuclear reactions,and first observed in 1956 by Dr Frederick Reines and Dr. Clyde Cowan, neurtinos either were beleived to have no mass or to have a negligible amount of mass. Ever since their discovery scientists wondered if this elusive particle that has no electric charge and is able to pass through the entire earth without hitting anything might not have some negligible amount of mass. Because they exist in great numbers in the universe, even a small mass could provide the "dark matter" that cosmologists beleive makes up the substance of the cosmos. Having a mass, neutrinos might also be able to change into neutrinos of other types, by a process called oscillation. They have no electrical charge and are believed to travel at or near the speed of light. Neutrinos react very little with matter and only rarely do they react with protons or neutrons through a force ! called "the weak force". Their discovery enabled scientists to work out a conservation of evergy, spin, and momentum for beta decay. There are six types of neutrinos, depending upon the subatomic particles with which they are associated: electon antineutrinos with electrons, electron neutrinos with positrons, muon neutrinos and antimeutrinos with muon reactions, and tau neutrinos and antineutrinos with massive tau particles. Mass is what determines the rate at which the wave function of a particle vibrates. If the waves of two neutrinos of different masses mingle, they beat against each other much like sound waves of different pitch . If neutrinos had no mass, their waves would have the same frequency and would not be able to beat at all. A particle detector at Los Alamos National Laboratory has captured eight events that could be the first direct sightings of neutrino oscillations. If verified, the observations will prove as well that neutrinos have mass. However such experiments are not easy to carry out. In the Liquid Scintillator Neutrino Detector experiment, a beam of protons from an accelerator is shot into a water target. Particles are absorbed and detected and some implications involving neutrino mass are made, and although this could help solve the dark matter problem it contributes nothing to the major puzzle the scientists are concerned with: the solar neutrino problem. Only about half the number of neutrinos that the theory predicts should come from the sun are actually detected. The deficit might be explained by presuming that the particles change to muon neutrinos and therefore escape detection. But if neutrinos change type over short distances as in the LSND experiment, the oscillations ! would average out over the 92 million miles that seperates the sun from the earth. Some other neutrino experiment have been undertaken to determine the number of neutrinos that actually reach the earth from the Sun and stars. One such experiment known as DUMAND, for Deep Underwater Muon and Neutrino Detector, Which was led by scientists from the Univ. of Hawaii, sought to install detectors in deep water off the coast of Hawaii's Big Island. But leaks and broken connections caused one expensive problem after another, and money for the project by the Department of Energy was recently ended. And just in November 1996 a collaboration of Greek and US physicists began their experiment called NESTOR (Neutrinos fom Supernova and Tervolt sources, Ocean Ridge). They began by lowering instument-laden platforms resembling umbrellas into the deepest part of the Mediterranean Sea off the southwest coast of Greece to test a system that will look for neutrinos coming up from the ocean floor. The earth is used

Media and Corporate Responsibility Essay Example | Topics and Well Written Essays - 1000 words

Media and Corporate Responsibility - Essay Example A corporation is more or less like a monster with several heads, where one head can be saying something that sounds very good and the other head can be doing something else that purely contradicts what was said earlier. Any corporation's main motive is to make profits. The only problem with profit making motive is that there is no such thing as "enough". Every act of the corporation undertaken in pursuit of maximizing profits is termed as "logical" or "rational". For instance, prosperous corporate giants taking advantage of cheap labor of starving people from under developed countries is considered pragmatic. The capitalistic world even manages to justify these acts as legitimate, a kind of boon granted to the down trodden. But how many of these corporations actually consider the legitimacy involved in the severe working conditions provided to those workers or the fairness involved in the proportion of the worker's pay to the profit earned by the corporation from such activities In the name of maximizing profits, corporations have become extremely deceitful without having any concern for the safety of others. For instance, many commercial dairies treat their cows with certain hormone in order to increase milk production. Though this method has been claimed to be harmless, it has neither been safe for the humans consuming this milk nor has it been easy for the cows. The cows, termed as "production units" by such dairies, experience painful effects such as broken limbs due to calcium deficiency and even early death as a result of these artificial methods. There are many corporations that use synthetic chemicals in their products which cause cancer, birth defects and other toxic effects. Most corporations are mendacious to such an extent that they do not even reveal the true test results of these products. The saddest part of this tragic situation is that these untruthful corporations, over the years, have totally lost the capacity to experience any guilt for their insensitive activities. Well-known companies and brands such as McDonald's, Nike, Adidas, Shell, and Barclays top the list of unethical companies. Such companies have no respect for any legal or social norms. They continue to break such norms and consider the compensation paid later on as an act of justification. But no compensation, irrespective of the amount involved, can actually compensate for the disaster caused by most of these unethical acts. There is no doubt about the fact that the corporations, though functioning with a self-centered motive, are producing other social benefits. But the self-centered motive has converted these corporations into Einstein's monster that has become so big that it has overpowered the people who initially created it. A corporation may be considered as a person in the eyes of law, but the fact still holds well that it is a person without a soul. Media Responsibility The media occupies a privileged position in modern society. But more than simply seeking out truth and reporting it to an otherwise ignorant populace, the Media themselves have an active role in influencing and shaping public opinion. That is why it is so very disturbing that any media might

Journal opinion article Essay Example | Topics and Well Written Essays - 500 words - 2

Journal opinion article - Essay Example This is used to measure the firms’ price changes which they receive by offering their goods and services. However, the declining energy prices along with controlled inflation were mutually agreed upon by 0.1%. There are few economists who rather than accepting that they couldn’t forecast well, put the blame on Labor Department. However, in order to foresee the price pressure expected to build on the economy, PPI is used which shows the sign of inflation. Traditionally it is not monitored so closely as compare to personal consumption and consumer price. Since January, The Labor Department has started including prices for their services along with the goods prices so that they can be able to keep a track of economic activity. As per their one of the economists, this revamped measure increased the PPI coverage but now they feel that their efforts of keeping everything transparent with respect to economy are something they are achieving at the fullest. This also shows that they need to adopt some volatile actions particularly for trade services. There were some changes experienced in sub-index profit margins at retailers as well as whole sellers. On the other hand one of the biggest jumps of 1.5% on record was observed in October. The economist somehow also missed seasonal adjustments, which are a statistical technique used to eradicate the weather impact, holidays etc. All distortions will be removed by the passage of a complete calendar year pertaining to poor seasonal adjustment, and on a monthly basis the seasonal adjustment process over or make the corrections in the raw price changes will result strangely. The Chief Economist quoted that this jump reflects technically and does not indicate and twist in the trend. He also said that he believes that due to statistical quirk they are experiencing increase in trade services. One of the factors causing this scenario might be slim profit margins, due to which minimal boost in profits

International Marketing Case Study Example | Topics and Well Written Essays - 3000 words

International Marketing - Case Study Example Today instead of the traditional approach of 'maximizing' the profits, organizations go ahead with multiple objectives, monetary as well as non-monetary. There are short-term objectives as well as long-term ones. Strategists are supposed to prioritize all such objectives, so that there is clarity and ease of decision making in situations where there is an apparent clash of objectives. Here we'll analyse Vodafone, its strengths, comparative advantages, its weaknesses and some of the opportunities that it can capitalize on in the Turkish telecom market. Vodafone has acquired competitive advantage over its rivals on account of its marketing efforts, brand building, value creation, innovation, operational efficiencies etc. Today Vodafone is one of the world's leading international mobile telecommunications group having an equity base in 27 countries across 5 continents, 186.8 million proportionate customers and 33 partner networks (Vodafone, 2006). Company's vision statement1 says, the c ompany aspires 'to be the world's mobile communications leader, enriching customers' lives and helping individuals, businesses and communities to be more connected in a mobile world'. With this vision company plans to invest in Turkey. The PEST or PESTEL analysis is a useful tool for any industry or b... The analysis mainly comprises of; Political factors Economic factors Socio-cultural factors Technological factors Environmental Factors Legal Factors All these factors have different relevance for different types of industries and businesses. Political The modern Republic of Turkey was founded in 1923 by the legendary Mustafa Kemal, better known as "Ataturk" or father of the Turks. The democratic tradition of modern Turkey has faced quite a few challenges with periods of instability. In the recent past Turkey has also been criticized for its human rights record. Amnesty International accused the Turkish government in November 2001 of systematically and regularly torturing its citizens. Corruption remains one of the key challenges for Turkey. After the parliamentary elections held in November 2002, the Justice and Development Party (AKP), a moderate Islamist group, won a resounding majority. This caused some worry amongst the proponents of Turkey's reforms program, as AKP is known to position itself as a champion of Turkey's beleaguered impoverished majority, and is therefore potentially vulnerable to damaging economic populism (Datamonitor, 2006). But so far all such apprehensions have been put to rest with the continuance of the e conomic reforms, a necessity for favorable investment climate in the country. Turkey has been successfully able to overcome the banking and currency crisis of 2000-2001 Economic Turkish economy was in real bad shape during the 1990s, with growth rates of about 3% only. The 2000-01 banking and currency crisis further crippled the economy. But with some active support from IMF, the economy has been able to stage a turnaround. Owing to successful economic and structural reforms, CAGR of the Turkish economy over 2000-2005

Effects of Heat Treatment on Seed Germination

Effects of Heat Treatment on Seed Germination Introduction Seed germination has been found to be influenced by many factors. Some of these include water availability, nutrients, light, incubation, and heat shock (Masamba, 1994). In the natural Western Australian environment, heat shock is most commonly provided by bushfires. Periodic fires result in an open environment providing enhanced moisture, light, and nutrients which are conducive to the survival of germinated seeds (Bell, Plummer, Taylor, 1993). There are many species of the Western Australian flora, especially in the Leguminosae families, that have a hardened testa in order to suppress germination until fire provides a better chance of seedling survival (Herranz, Ferrandis, Martinez-Sanchez, 1998). Heat shock is required in some plant species to fracture the hard seed coat which allows for water imbibition, gas exchange, and releases the embryo from physical restraints (Mucunguzi, Oryem-Origa, 1996). Short exposures to the high temperatures reached in soil during fires can greatly increase germination percentages of certain species (Bell et al., 1993). Under laboratory conditions, the heat shock usually provided by fire can be simulated using boiling water. Dry heat or scarification and acid treatments can also increase the percent of seeds germinated (Bell et al., 1993). The aim of the experiment was to examine the effects of different temperature heat treatments on the percent germination of four species of legumes. Materials and Methods Plant Material Four different commercially obtained plant species were used to examine the effects of different heat pre-treatments on the percent seed germination of set sample sizes. The four species used in the experiment were Kenndia coccinea, Acacia saligna, Hardenbergia, and Acacia pulchella. Experimental Treatment A total of 600 seeds were taken from each species and divided into sets of 110. Each set was pre-treated at one of five temperatures. The temperatures were: room temperature (24ËÅ ¡C), 40ËÅ ¡C, 60ËÅ ¡C, 80ËÅ ¡C, and 100ËÅ ¡C. The seeds from each treatment were divided into 50 labelled petri dishes, 11 seeds per dish. All of the seeds in a single petri dish underwent the same pre-treatment. The petri dishes were then placed into a dark cupboard for incubation at room temperature and randomized. Viability Test In order to assess the viability of the seeds collections used for the germination experiment, a tetrazolium test was carried out on 96 untreated seeds from each species. The testa of each seed was cracked before being tested. Scoring Germination The numbers of seeds germinated in each petri dish were recorded at the end of each week for four weeks, along with the species and pre-treatment the seeds underwent. A drop of fungicide was used to kill any moulds that were found growing in the petri dishes during incubation. Statistical Analysis The heat treatments of each species were compared using the chi square analysis, allowing for 5% error. The null hypothesis (Ho) for the chi square tests is that the treatments had no effect on the percent of seeds germinated. The alternate hypothesis (Ha) is that the different treatments did have an effect on the percent of seeds germinated. Results The chi square analysis compares the total number of germinated seeds between treatments for one species to determine if statistically, we should accept or reject the null hypothesis. Table 1 displays that Kenndia coccinea, Acacia saligna, and Acacia pulchella all have a chi square value greater that the 5% error value. Therefore, we can be 95 % confident that the Ho should be rejected and Ha accepted. Hardenbergia, however, has a chi square value less than the 5% error value, therefore, Ho is accepted. Table 1 Chi square values and degrees of freedom calculated from the number of germinated seeds of four different plant species after a variety of controlled heat treatments Species Chi Square value 5% error Kenndia Coccinea 52.90909 9.49 Acacia saligna 39.84615 9.49 Hardenbergia 6.15444 9.49 Acacia pulchella 38.5 9.49 Data shows that three of the four chi square values are greater than the 5% error value. This indicates that the null hypothesis should be rejected for Kenndia coccinea, Acacia saligna, and Acacia pulchella. Therefore, Ha is accepted for these species. It is obvious from the graphs in figure 1 that the different heat treatments had little effect on the percent germination of c) Hardenbergia. Significant variations can, however, be seen in the germination of the other three species. Attention should be drawn to the significant increase in germination of d) Acacia pulchella between the 80ËÅ ¡C treatment and 100ËÅ ¡C treatment. a) b) c) d) Fig. 1 Percent germination of a) Kenndia Coccinea, b) Acacia saligna, c) Hardenbergia, and d) Acacia pulchella at the end of a four week growth period. Each species had 500 seeds which were divided into five different heat pre-treatments. Discussion Heat shock treatments have two primary effects on seeds that cease dormancy. Cracking of the seed coat appears to be most common result of heat shock; however, heat can also be used to denature seed coat inhibitors (Hanley, Lamont, 2000). It is obvious from the information displayed in table 1 and figure 1 that temperature has a significant effect on the germination of Kenndia coccinea, Acacia saligna, and Acacia pulchella. In the natural environment, extreme temperatures on the soil surface can be lethal to seeds (Bell et al., 1993). Due to thermal diffusion, seeds below 6 to 8 cm may be too deep to have their seed coats cracked (Hanley, Lamont, 2000). A. pulchella has developed a relationship with ants to maximise germination. The ants bury the seeds at a depth of approximately 4cm which is the depth where heat penetration and temperature required to break dormancy appears to converge (Hanley, Lamont, 2000). A similar heat pre-treatment experiment (Table 2) to the one carried out in this report was carried out by Bell, Plummer, Taylor (1993). They examined the effects of seed scarification and boiling on the percent germination of native Western Australian legumes. The data indicates that a 300 second heat treatment tends to reduce germination percentages in most of the species listed in table 2. Acacia pulchella is one Western Australian species that shows no significant germination in the percent germination (Bell et al., 1993). This information suggests that A. pulchella evolved in an environment that experiences prolonged burning (Bell et al., 1993). The results obtained by Bell, Plummer, Taylor (1993) after examining the effects of no pre-treatments, seed scarification, and heat shock on 55 species of native Western Australian legumes. It is interesting to note that the percent germination graph of A. saligna in figure 1 shows an increase in germination as treatment temperature increased. This result is significant as A. saligna is a coastal habitat species whose seeds have the capacity to survive mild fires, but are unable to endure intense heat (Herranz et al., 1998). While high temperatures are required to crack the seed coat of many native Western Australian species, germination may also be cued by incubation temperatures that would best support the survival of the seedlings (Bell et al., 1993). It is possible that this factor may have influenced the germination results of K. coccinea, A. saligna, Hardenbergia, and A. pulchella. In Western Australia, heat is a key requirement for the successful germination of many plant species. Combinations of factors, however, are often required to maximise the chance of germination of any plant species. Due to the diversity of flora in Western Australia, more research is required to determine the optimal environment for commercial or private cultivation of many species.

Essay example --

†¢ Establish topic and connection with audience. †¢ Establish credibility on the topic and then preview the main points. †¢ Preview the key points in the body of the outline (at least 3 main points). †¢ Summarize and conclude with a closure device. †¢ Include at least 1 peer reviewed source with proper citations. My Favorite Moment Speech – 3 minutes †¢ Describe a favorite moment. †¢ Demonstrate your comprehension of basic tools of an address. †¢ Imagine you are asked by your boss to present this Favorite Moment to a group (general group at your employment). Your boss asks you: Can you make that speech tomorrow? You say â€Å"Yes, of course.† †¢ Decide on a moment in your life which best exemplifies who you are and/or wish to be and then use â€Å"the moment† as evidence. †¢ Present clearly and follow your outline. Demonstration Speech Outline †¢ Two (2) pages that describe what you are going to demonstrate. †¢ You are researching a topic unfamiliar to you and gaining a general understanding and passing it along to the audience. †¢ Imagine you are asked to make a demonstration speech but there is no classroom or ballroom. †¢ Approximately 25 people are called together and you are asked immediately to make this demonstration speech. Where do you go? How do you pull them together? What is your course of action? †¢ Identify greeting and attention getting device. †¢ Establish topic and connection with audience. †¢ Establish credibility on the topic and then preview the main points. †¢ Preview the key points in the body of the outline (at least 3 main points). †¢ Summarize and conclude with a closure device. †¢ Include at least 2 peer reviewed sources with proper citations. Demonstration Speech – 5 minutes †¢ Decide on a topic that you wan... ...estion. The paper must be a minimum of 5 pages in length (double-spaced and with a type font no larger than 12 pts.) and must include at least 3 sources, each of which must be cited within the text of the document using the MLA style. The paper must use at least 2 primary sources, including no less than 1 source from an academically recognized journal or book located in the database of the college’s Learning Resource System. The paper may use no more than 1 secondary source. A properly formatted Works Cited page must also be provided. The value of the paper is 50 points. Assessment of the paper will be based on the points and rubric described in the syllabus. Once graded, the number of points earned will be added to the student’s cumulative total for the course. 1. Paper 1- Choose a speech in Chapter 3 of the Glover book, which focus on knowing your audience.