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Question

Let (+) tartaric acid has a specific rotation of + 11.1. Calculate the specific rotation of a mixture of 68% (+) tartaric acid and 32% (-) tartaric acid Report your answer to the closest integer.

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Solution

Enantiomeric excess =dld+l×100=683268+32×100=36%
Optical rotation of this mixture =36100×(11.1)=4

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