Laboratory Techniques in Organic Chemistry
4th Edition
ISBN: 9781464134227
Author: Jerry R. Mohrig, David Alberg, Gretchen Hofmeister, Paul F. Schatz, Christina Noring Hammond
Publisher: W. H. Freeman
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Question
Chapter 3, Problem 3Q
Interpretation Introduction
Interpretation:
The theoretical yield and the percent yield of acetylsalicylic acid needs to be calculated.
Concept Introduction:
A limiting reactant limits the amount of product formed in the reaction. The theoretical yield is the amount of product formed from limiting reactant. The percent yield can be calculated from theoretical yield and actual yield as follows:
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If you were to use 6.00 g salicylic acid and an excess of acetic anhydride in the synthesis of aspirin, what would be the theoretical yield of acetylsalicylic acid in moles? In grams? Show your solution.
2.5 grams of methyl orange was synthesized by using sulfanilic acid dihydrate, 3 g of anhydrous Na2CO3, 3.5 g of NaNO2, 12 mL of HCl and 6 mL of N,N-dimethylaniline and other necessary chemicals. Write down all the reaction steps and calculate the % yield of methyl orange synthesized
1. Write out the balanced equation for the reaction between salicylic acid and aceticanhydride
.2. Calculate the percent yield for the above reaction if the amount of aspirinobtained was 2.301 g.
3. Calculate the theoretical yield of aspirin if you start with 2.687 g of salicylic acidand an excess of acetic anhydride.
4. If you were to start with 1.00 g of salicylic acid, what volume of acetic anhydridewould be needed to completely react with it? The density of acetic anhydride is1.082 g/mL.5. According to your results from part 3 of this experiment, what can you say aboutthe purity of your aspirin? Be as specific as possible.6. Explain why acetic acid is unlikely to be a contaminant in your solid aspirin.7. Look up and record the boiling point of acetic acid, and explain why only some ofit evaporates from the reaction mixture.8. If you measured the melting point of the solid product from this experiment andobtained a melting range of 122-128 ℃, what does this tell you?9. Aspirin that…
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Laboratory Techniques in Organic Chemistry
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