Question

pheryl 113-S-UsHs). Please propose a mechanism for this p presence-of AIC,to give di (7%) 3. For each of th 10-cm potai meter sample container. (6%) [A] A ( e following questions, assume that all measurements are made in 0-cr'solution of 0.4 g of optically active 2-butanol in water displays an opticaVrotation of [B] A solution of pure hat is its(specific rotation (3%) romobutane in ethanol is found to have an observed 25 C. If [a] for (S)-2-bromobutane is 23.1, what is the concentration of the solution? (390) 01 (obsevve 协。 0,04、 22 1?

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Answer 1

3) A

Volume of solution = 10 cc = 10 mL

Mass of solution = 4 g

Density/conc of solution = 0.4/10 = 0.04 g/mL

Observed rotation = -0.56 ^o

Specific rotation = observed rotation / ( Length in 1 dm) x concentration of solution

= -0.56 ^o /(1 x 0.04 g/ml)

= 14^o

(B)

Specific rotation = 23.1^o

Observed rotation = 57.3 ^o

Length = 1 dm

Specific rotation = observed rotation / ( Length in 1 dm) x concentration of solution

23.1 = 57.3 ^o /(1 x C)

= 2.481 g/ml

= or 2.48 g/cc