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Your two primary objectives in this experiment will be to synthesize and analyze aspirin. There is more than one way to synthesize aspirin; in this experiment, you will react acetic anhydride with salicylic acid in the presence of phosphoric acid (which acts as a catalyst). (10) Take a small sample of the aspirin and place it in a test tube and 1 ml of water. (11) Add 1 drop of 1 Ferric chloride solution to test for the phenolic hydroxyl group. The procedures for synthesizing the acid appear in the procedure section below. Acetylsalicylic acid is also called aspirin. It is an anti pyretic substance (has the ability to lower high body temperatures to normal) and an analgesic substance (able to relieve minor pain). Salicylic acid is reacted acetic anhydride to form acetylsalicylic acid. It is important to purify this compound because of contaminating acid. Synthesis: The synthesis of aspirin is classified as an esterification reaction.
Caution: The solution may boil from the heat of decomposition of the excess acetic anhydride; handle the flask carefully! (6) After the decomposition is complete, add 40 ml of distilled water and stir the solution until crystals begin to form.
Calculate the percent yield of your synthesis. Measure the melting temperature of your aspirin sample. Conduct a colorimetric analysis of your aspirin sample. Sensors and Equipment. This experiment requires each of the following Vernier sensors and equipment (unless otherwise noted Colorimeter Stainless Steel Temperature Probe SpectroVis Plus ( optional ) Additional Requirements You may also need an interface. CHM 1025C/CHM 1032C Experiment 14: Synthesis of an Acid. Purpose: To synthesize an acid to observe the process of purification via re-crystallization Objectives: 1. The student will gain some knowledge of synthetic methods. 4. Using the actual mass of the synthesized acid and the theoretical yield, calculate the percent yield for this experiment). Recommended for High School. Introduction Aspirin, the ubiquitous pain reliever, goes by the chemical name acetylsalicylic acid. One of the compounds used in the synthesis of aspirin is salicylic acid, which is itself a pain reliever that was known to many ancient cultures, including the Native Americans who extracted it from willow tree bark. It is a moderately effective agent in the treatment of rheumatoid arthritis. Thirty million pounds usually in 5 grain tablets are used annually in the United States alone. Most of the aspirin is produced by the reaction you will use. 2. The student will learn the techniques of crystallization and re-crystallization to purify a synthesized substance. 3. The student will re-enforce the technique of determining melting points on the unknown acid. "hostname m/pi useDefaultThumbs true defaultThumbImgs m/stm/images/placeholders/default_paper_m/stm/images/placeholders/default_paper_m/stm/images/placeholders/default_paper_m/stm/images/placeholders/default_paper_m/m/m/signup joinUrl m/signup? m/signup? m2Fjoin joinFreeUrl essays/?newuser1 section search analytics googleId UA ". (12) Remove a sample a dry it and determine the melting point of the aspirin. (13) Weigh the dry sample next week. (14) Save the sample for you to take home and remember this class by keeping it in your medicine cabinet Calculations for your Lab Notebook: 1. Instructions for Logger. Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments. Their perceptions, while more immediate, reflect the demands of federal bureaucracy and the prevailing national ethos. The images of Native Americans made by outsiders often tell us as much about the people making them as they do their subjects. Setbacks and acceptance Im Not Back Yet, nonfiction by Leonard Tuchyner Waiting For a Heart to Heal, poetry by Leonard Tuchyner The Habit of Hands, poetry by Nancy Scott The Last Spring, poetry For Greta by Sally Rosenthal My Ha). Doc Louis, the trainer character in the boxing video game Mike Tyson's Punch-Out! (1987 is based on his likeness. His home, when he died, was in the Corona section of Queens County, New York City. Dont rush writing. Make sure your student has a quiet place to write and help them gauge how long it will take to complete a writing assignment. Writing usually takes longer than we think. Citing articles via Web of Science. Citing articles via Google Scholar Load related web page information. It is a moderately effective agent in the treatment of rheumatoid arthritis. Thirty million pounds usually in 5 grain tablets are used annually in the United States alone. Most of the aspirin is produced by the reaction you will use.
Calculate the percent yield of your synthesis. Measure the melting temperature of your aspirin sample. Conduct a colorimetric analysis of your aspirin sample. Sensors and Equipment. This experiment requires each of the following Vernier sensors and equipment (unless otherwise noted Colorimeter Stainless Steel Temperature Probe SpectroVis Plus ( optional ) Additional Requirements You may also need an interface.