The specific rotation for a pure enantiomer is known to be-45 g mL-1 dm-1. A sample containing both enantiomers is found to have an observed rotation of -0.50° in a 1dm tube at a concentration of 4.2g/100 mL. What is the optical purity of the sample?

The specific rotation for a pure enantiomer is known to be-45 g mL-1 dm-1. A sample containing both enantiomers is found to have an observed rotation of -0.50° in a 1dm tube at a concentration of 4.2g/100 mL. What is the optical purity of the sample?

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter92: Polarimetry

Section: Chapter Questions

Problem 1P

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Question

The specific rotation for a pure enantiomer is known to be -45 g-
mL-1 dm-1. A sample containing both enantiomers is found to have
an observed rotation of -0.50° in a 1dm tube at a concentration of
4.2g/100 mL. What is the optical purity of the sample?
O a. 20.6%
Ob. 30.8%
Oc. 26.4%
O d. 36.5%

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