Organic II Lab: Optical Rotation and Chirality A) -2.1 degrees B) -2.8 degrees C

Question

Organic II Lab: Optical Rotation and Chirality

A) -2.1 degrees

B) -2.8 degrees

C) -1.1 degrees

D) -3.2 degrees

E) -4.7 degrees

Organic II Lab: Optical Rotation and Chirality 2) The optical rotation of a sample composed of only 2-pentanol is determined to be [alpha]obs = -0.18 degrees. If the cell path length was 0.2 dm and the concentration of 2-pentanol in the sample was 0.19 g/ml. What is the specific observed rotation? A) -2.1 degrees B) -2.8 degrees C) -1.1 degrees D) -3.2 degrees E) -4.7 degrees

Explanation / Answer

[alpha]lT = alpha/lc

Where:

[alpha]lT = -0.18 / (0.2) (0.19)

= 4.740

   = 4.70  [2 sig figures as in 0.19 and 0.18]

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