Organic Chemistry: Structure and Function
Organic Chemistry: Structure and Function
8th Edition
ISBN: 9781319079451
Author: K. Peter C. Vollhardt, Neil E. Schore
Publisher: W. H. Freeman
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Chapter 5, Problem 48P

(a)

Interpretation Introduction

Interpretation : The specific rotation needs to be determined.

Concept Introduction : The rotation of the light is ratio of the optical rotation to the product of the length and concentration of the solution.

(b)

Interpretation Introduction

Interpretation : The value of optical rotation of the solution needs to be determined.

Concept Introduction : Optical rotation is association of the plane about the route of the motion when the light passes through the material and light is linearly polarized.

(c)

Interpretation Introduction

Interpretation : The concentration of the solution needs to be determined.

Concept Introduction : The optical rotation is a phenomenon of the light rotation through the material due to the linearly polarized light. It depends on the length of the cell, and wavelength of light.

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The specific rotation, [a], for (-)-pseudoephedrine is -52. What is the observed rotation for a solution of 0.70 g of (-)- pseudoephedrine in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees. The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is +1.3 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?
Consider a solution that contains 74.0% R isomer and 26.0% S isomer. If the observed specific rotation of the mixture is -45.0°, what is the specific rotation of the pure R isomer? [a] =
2. The observed rotation of a compound, X (14.0g dissolved in water to make 100ml. of solution) in a polarimeter tube of length 30cm is +10.5°. What is the specific rotation of X?
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