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Posted by on Monday, March 30, 2009 at 10:19pm.

A student carried out the synthesis of aspirin, starting with 3.22 g of salicylic acid. After carrying out the reaction, recrystallizing and then drying the product, the student obtained 3.65 g of aspirin. Calculate the percent yield.

I'm pretty sure it's (3.65 g / 3.22 g)*100 = 113.35%.

Is that correct?

Also, could someone please explain what is meant by creating a flow diagram for this experiment?

  • Chemistry - , Monday, March 30, 2009 at 11:53pm

    No, you didn't do the percent yield correctly. You must use the 3.22 g salicylic acid with which you started to calculate how much aspirin you should have obtained if the reaction was 100% efficient. I hastily went through it and it is approximately 4 grams but you need to go through more accurately than I. The value you obtain is the theoretical yield. Then
    %yield = (actual yield/theoretical yield)*100 = ??
    actual yield is 3.65 grams.
    theoretical yield (from my data) is 4 but you will have a slightly different number. A yield of greater than 100% is great if you can get it but there is no free lunch (said another way there is no perpetual motion).

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