If purified Acetylsalicylic acid is not completely dry before the final weighing, how does this ..?
affect theoretical yield and the calculated percent yield? What could be done to ensure the ASA was as dry as possible?
2.when esters are exposed to moisture they can be hydrolyzed forming a carboxylic acid and an alcohol. If ASA is hydrolyzed what will the products be? What is a quick test to determine if ASA in the home has been hydrolyzed?
Answer:
1. If there's water present in your purified product, it will weigh more, thus artifically inflating your calculated percent yield. So it will seem like your yield is greater than it actually is. Theoretical yield will be unchanged because it's based on the amount of reactant and possible product. Often, with organic products like this, the organic solution is "dried" with MgSO4 (magnesium sulfate), and then filtered. MgSO4 is a white powder that effectively soaks up any water, so while you have your organic product in solution, you can filter off the MgSO4 and water. If the product has already been isolated from solution and is in a solid state, you can dry it in a drying oven for a few hours, which should remove most of the water.
2. The products of hydrolysis would be 2-hydroxybenzoic acid and acetic acid. A quick test would be to smell the mixture. Acetic acid is just the scientific name for vinegar, so if hydrolysis has taken place, you'll smell vinegar.
Good luck!
HAHA WOW
idk the second question but i actually had that exact lab with that exact sentence about the acetylsalicylic acid being wet
i belive the theoretical yield doesnt change
it would make you think you recovered more that you really did and increase your percent yield
and to dry it totally, you could leave it i a dessicator overnight with an very hygroscopic substance like anhydrous sulfuric acid, anhydrous naoh or anhydrous calcium sulfate
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2.when esters are exposed to moisture they can be hydrolyzed forming a carboxylic acid and an alcohol. If ASA is hydrolyzed what will the products be? What is a quick test to determine if ASA in the home has been hydrolyzed?
Answer:
1. If there's water present in your purified product, it will weigh more, thus artifically inflating your calculated percent yield. So it will seem like your yield is greater than it actually is. Theoretical yield will be unchanged because it's based on the amount of reactant and possible product. Often, with organic products like this, the organic solution is "dried" with MgSO4 (magnesium sulfate), and then filtered. MgSO4 is a white powder that effectively soaks up any water, so while you have your organic product in solution, you can filter off the MgSO4 and water. If the product has already been isolated from solution and is in a solid state, you can dry it in a drying oven for a few hours, which should remove most of the water.
2. The products of hydrolysis would be 2-hydroxybenzoic acid and acetic acid. A quick test would be to smell the mixture. Acetic acid is just the scientific name for vinegar, so if hydrolysis has taken place, you'll smell vinegar.
Good luck!
HAHA WOW
idk the second question but i actually had that exact lab with that exact sentence about the acetylsalicylic acid being wet
i belive the theoretical yield doesnt change
it would make you think you recovered more that you really did and increase your percent yield
and to dry it totally, you could leave it i a dessicator overnight with an very hygroscopic substance like anhydrous sulfuric acid, anhydrous naoh or anhydrous calcium sulfate
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