A solution containing 0.4 g/mL of a pure S enantiomer is a 1 dm polarimeter rotates plane polarized light by +5.6°.What is the rotation of a solution containing 0.8 g/mL of the S enantiomer in the same polarimeter?

Question

Quizplus · Accepted Answer

The rotation of a solution is directly proportional to its concentration. As the concentration of the S enantiomer has doubled from 0.4 g/mL to 0.8 g/mL, it is expected that the rotation will also double. Therefore, the rotation of the solution containing 0.8 g/mL of the S enantiomer in the same polarimeter is +11.2° (2 x 5.6°), which is option B.

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