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Chemistry / Organic Chemistry 9 / Chapter 5 / Problem 5-32

Organic Chemistry | 9th Edition | ISBN: 9780321971371 | Authors: Leroy G. Wade, Jan W. Simek

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Calculate the specific rotations of the following samples taken at 25 C using the sodium

Chapter 5, Problem 5-32

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QUESTION:

Calculate the specific rotations of the following samples taken at 25 C using the sodium D line. (a) 1.00 g of sample is dissolved in 20.0 mL of ethanol. Then 5.00 mL of this solution is placed in a 20.0-cm polarimeter tube. The observed rotation is 1.25 counterclockwise. (b) 0.050 g of sample is dissolved in 2.0 mL of ethanol, and this solution is placed in a 2.0-cm polarimeter tube. The observed rotation is clockwise 0.043.

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QUESTION:

Calculate the specific rotations of the following samples taken at 25 C using the sodium D line. (a) 1.00 g of sample is dissolved in 20.0 mL of ethanol. Then 5.00 mL of this solution is placed in a 20.0-cm polarimeter tube. The observed rotation is 1.25 counterclockwise. (b) 0.050 g of sample is dissolved in 2.0 mL of ethanol, and this solution is placed in a 2.0-cm polarimeter tube. The observed rotation is clockwise 0.043.

ANSWER:

Step 1 of 3

Specific rotation is a measure of the ability of a compound to rotate the plane of polarized light. Polarized light is light in which the waves vibrate in a single plane.

Equation for specific rotation is

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