Can You Get a Yield Greater Than 100% for Impure Benzoic Acid?

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SUMMARY

The discussion centers on calculating the percentage yield of impure benzoic acid synthesized from benzyl alcohol. The theoretical yield is 5.93g, while the experimental yield of the impure acid is 6.13g, resulting in a calculated percentage yield of 103.4%. This yield exceeds 100%, which is acceptable for impure substances due to the presence of unaccounted impurities. The discussion emphasizes the need to rationalize the impurity and suggests methods for its removal in subsequent analysis.

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  • Understanding of theoretical vs. experimental yield in chemistry
  • Basic knowledge of benzoic acid synthesis from benzyl alcohol
  • Familiarity with percentage yield calculations
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Chemistry students, organic chemists, and researchers involved in synthesis and purification of organic compounds will benefit from this discussion.

_Greg_
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i'v synthesized benzoic acid from benzyl alcohol and i have a theoretical value for the yield and and experimental yield of impure acid.

Theoretical Yield = 5.93g
Impure Yield from experiment = 6.13g

Now, my paper asks for the percentage yield of my impure acid, how does that work?

If i do:
6.13/5.93 x 100 then I am going to get a percentage yield of 103.4%

Is that right? surely i can get a yield greater than 100% ?

Later in the experiment it asks for the yield of pure acid which i have done with a reasonable %, i just don't understand it for the impure acid.
 
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Your yield for a crude material can be anything... even >100%. You must explain (rationalize) the impurity in your discussion and suggest a method for its removal.
 

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