QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
# (+)-Tartaric acid has a specific rotation of + 12.0°. What is the specific rotation of a mixture of 75% (+)-tartaric acid and 25% (-)-tartaric acid?
A. + 4.0°
B. + 6.0°
C. + 8.0°
D. + 9.0°
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Step 1: Understand the problem
We are given the specific rotation of (+)-tartaric acid as + 12.0° and the percentage of a mixture containing (+)-tartaric acid and (-)-tartaric acid. We need to find the specific rotation of this mixture.
Step 2: Recall the concept of specific rotation
The specific rotation of a chiral molecule is an optical activity measurement that describes the magnitude of its rotation of plane-polarized light. When two enantiomers are present in a solution, their rotations cancel each other out to some extent. The net rotation depends on the mole fractions of the enantiomers.
Final Answer
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