ORGANIC CHEMISTRY-ACCESS
ORGANIC CHEMISTRY-ACCESS
6th Edition
ISBN: 9781260475586
Author: SMITH
Publisher: MCG
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Chapter 5.12, Problem 32P
Interpretation Introduction

Interpretation: The specific rotation of the given compound is to be calculated.

Concept introduction: The specific rotation, [α] of a compound is calculated by the formula,

[α]=αl×c

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A 1.52 M solution of (R)-2-butanol is mixed with an equal volume of a 0.760 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long. What observed rotation is expected? The specific rotation of (R)-2-butanol is -13.9 degrees mL g-¹ dm¯¹. α = deg
The specific rotation for (-)-methylphenidate is -38° mL g¹ dm¯1. Path length of the polarimeter is 1 dm. 1 You dissolve 0.5 g of a mixture of (-)-methylphenidate and its enantiomer in 4 mL of water. You place the sample into a polarimeter and the observed rotation is found to be -0.2°. What percent of the mixture is composed of (-)- methylphenidate? (Round your answer to the nearest whole percent.) The numerical values in this calculation will change with each attempt. Double check before submitting additional attempts. 17
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