How do you account for the smell of vinegar when an old bottle of aspirin is opened?
How do you account for the smell of vinegar when an old bottle of aspirin is opened?
Homework Answers
Over time, aspirin (an ester) can be hydrolyzed by H2O that contaminates the container. The hydrolysis products of aspirin are salicylic acid and acetic acid.
Vinegar is made of dilute acetic acid. This hydrolysis product therefore gives the vinegar smell to an old aspirin bottle.
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How do you account for the smell of vinegar when an old bottle of aspirin is opened?
2. If you open a bottle of older aspirin you find in the medicine cabinet, it may smell like vinegar. If you tested...
2. If you open a bottle of older aspirin you find in the medicine cabinet, it may smell like vinegar. If you tested it with FeCl, it would likely give a purple color. What happened to the aspirin?
3. 0.69g of salicylic acid was reacted with 0.6g acetic anhydride in the presence of concentrated phosphoric acid...
3. 0.69g of salicylic acid was reacted with 0.6g acetic anhydride in the presence of concentrated phosphoric acid to yield 0.80g of acetyl salicylic acid (see below). Determine the limiting reagent and percent yield. C-CH OH COOH CH, COOH CHC Salicylic acid MW 138.12. mp 159C Acetic anhydride Acetylsalicylic acid M W 102.09. bp 140CMW 180.15. mp 128-1370 4. How do you account for the smell of vinegar when an old bottle of aspirin opened?
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H3PO4 OH + OH OH salicylic acid acetic anhydride acetic acid acetylsalicylic acid (aspirin) 1. Why...
H3PO4 OH + OH OH salicylic acid acetic anhydride acetic acid acetylsalicylic acid (aspirin) 1. Why is it better to perform acetylation with acetic anhydride rather than using a Fischer esterification with acetic acid? 2. Draw a complete arrow-pushing mechanism for the reaction. 3. When an old sample of aspirin is left in moist conditions, it will begin to smell like vinegar. Draw a reaction scheme and briefly explain what happened.
4. Mr. Burnes bought a bottle of vinegar and wondered how concentrated the acetic acid (CH-COOH;...
4. Mr. Burnes bought a bottle of vinegar and wondered how concentrated the acetic acid (CH-COOH; mm = 60.05 g/mol) was inside. He titrated it with 0.00182 M NaOH that he found in a general chemistry laboratory. It took 9.90 mL of NaOH to reach the equivalence point. See titration curve on next page. A. What is the concentration of acetic acid if 23.7 mL of vinegar was used for the titration? B. Mr. Burnes bought the economy size bottle...
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Jane Scott, 21 years old, comes to the health-care provider to determine what she can do for mild dysmenorrheal. She states that this is not incapacitating, but creates discomfort during the first cky of her menses. She states that she does not want anything that makes her sleepy and that she has not tried any over-the-counter drugs. After further discussion with Ms. Scott, the health-care provider suggests that she try aspirin or ibuprofen as a beginning drug to see how...
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xperim fr G Orgeic nd c y eetandndeg 5. Below are structures of common aspinin substitutes Why do ibuprofen and naproxen not give a 376 positive test with 1% ironllD chloride? Why does acetaminophen give a positive test? CH3 н, CH-COOH CH, -сH-Сн, CH, CH CH,O CH-COOH OH Cн, Naproxen Acetaminophen Вргобео 6. Bottles containing old aspirin tablets often smell this smell? How does this chemical form? vinegar. The presence of what chemical causes 7. You may have observed that...
2. If you open a bottle of older aspirin you find in the medicine cabinet, it may smell like vinegar. If you tested it with FeCl, it would likely give a purple color. What happened to the aspirin?
3. 0.69g of salicylic acid was reacted with 0.6g acetic anhydride in the presence of concentrated phosphoric acid to yield 0.80g of acetyl salicylic acid (see below). Determine the limiting reagent and percent yield. C-CH OH COOH CH, COOH CHC Salicylic acid MW 138.12. mp 159C Acetic anhydride Acetylsalicylic acid M W 102.09. bp 140CMW 180.15. mp 128-1370 4. How do you account for the smell of vinegar when an old bottle of aspirin opened?
H3PO4 OH + OH OH salicylic acid acetic anhydride acetic acid acetylsalicylic acid (aspirin) 1. Why is it better to perform acetylation with acetic anhydride rather than using a Fischer esterification with acetic acid? 2. Draw a complete arrow-pushing mechanism for the reaction. 3. When an old sample of aspirin is left in moist conditions, it will begin to smell like vinegar. Draw a reaction scheme and briefly explain what happened.
4. Mr. Burnes bought a bottle of vinegar and wondered how concentrated the acetic acid (CH-COOH; mm = 60.05 g/mol) was inside. He titrated it with 0.00182 M NaOH that he found in a general chemistry laboratory. It took 9.90 mL of NaOH to reach the equivalence point. See titration curve on next page. A. What is the concentration of acetic acid if 23.7 mL of vinegar was used for the titration? B. Mr. Burnes bought the economy size bottle...
Jane Scott, 21 years old, comes to the health-care provider to determine what she can do for mild dysmenorrheal. She states that this is not incapacitating, but creates discomfort during the first cky of her menses. She states that she does not want anything that makes her sleepy and that she has not tried any over-the-counter drugs. After further discussion with Ms. Scott, the health-care provider suggests that she try aspirin or ibuprofen as a beginning drug to see how...
xperim fr G Orgeic nd c y eetandndeg 5. Below are structures of common aspinin substitutes Why do ibuprofen and naproxen not give a 376 positive test with 1% ironllD chloride? Why does acetaminophen give a positive test? CH3 н, CH-COOH CH, -сH-Сн, CH, CH CH,O CH-COOH OH Cн, Naproxen Acetaminophen Вргобео 6. Bottles containing old aspirin tablets often smell this smell? How does this chemical form? vinegar. The presence of what chemical causes 7. You may have observed that...
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