Question

10) A pure sample of the (+) enantiomer of compound X (326 mg) is dissolved in 2.0 ml of an appropriate solvent, and the solution placed in 30 cm polarimeter cell. Three polarimeter readings were recorded: 0.710°, 0.695° and 0.705°. (a) Calculate the average observed rotation. (1) (b) Calculate the specific rotation of the compound. (2) (c) An enantiomeric mixture of the compound gave a rotation of -0.44°. Calculate the enantiomeric composition of the solution. (5)

          10) A pure sample of the (+) enantiomer of compound X (326 mg) is dissolved in 2.0 ml of an appropriate solvent, and the solution placed in 30 cm polarimeter cell. Three polarimeter readings were recorded: 0.710°, 0.695° and 0.705°.

(a) Calculate the average observed rotation. (1)

(b) Calculate the specific rotation of the compound. (2)

(c) An enantiomeric mixture of the compound gave a rotation of -0.44°. Calculate the enantiomeric composition of the solution. (5)

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10) A pure sample of the (+) enantiomer of compound X (326 mg) is dissolved in 2.0 ml of an appropriate solvent, and the solution placed in 30 cm polarimeter cell. Three polarimeter readings were recorded: 0.710°, 0.695° and 0.705°.

(a) Calculate the average observed rotation. (1)

(b) Calculate the specific rotation of the compound. (2)

(c) An enantiomeric mixture of the compound gave a rotation of -0.44°. Calculate the enantiomeric composition of the solution. (5)

Added by Darnell C.

Organic Chemistry

Paula Yurkanis Bruice 4th Edition

Chapter 5

Instant Answer

Solved by Expert Breanna Ollech

04/07/2024

Step 1

So, (0.710 + 0.695 + 0.705) / 3 = 0.703 degrees. (b) The specific rotation ([α]) of a compound is calculated using the formula [α] = α / (l*c), where α is the observed rotation, l is the length of the polarimeter cell in decimeters (dm), and c is the Show more…

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