Question:

An elixir contains 47 % v/v alcohol, what is the proof spirit according to USP:

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In USP, proof is calculated as twice the percentage of alcohol by volume. Therefore, a \(47\%\) v/v alcohol elixir corresponds to approximately \(82\%\) proof spirit.

Updated On: Mar 5, 2025

  • 70%
     

  • 82%
     

  • 63%
     

  • 91%
     

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The Correct Option is B

Solution and Explanation

The proof spirit is twice the percentage of alcohol by volume. Since the elixir contains \(47\%\) v/v alcohol, the corresponding proof spirit is 94 proof \((47\% 2)\). According to the USP, \(82\%\) alcohol corresponds to a 94 proof spirit (which is approximately double the percentage of alcohol content).

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