Question

S(+) Mono Sodium Glutamate (MSG) is a flavour enhancer used in many foods. Fast foods often contain substantial amount of MSG and is widely used in Chines food. If one mole of above MSG was placed in 845 ml solution and passed through 200 mm tube, the observed rotation was found to be `+9.6^(@)`.

Find out the approximate percentage composition of (-) MSG in a mixture containing (+) MSG and (-) MSG whose specific optical rotation is `-20^(@)`
A. 0.833
B. 0.167
C. 0.916
D. 0.74

Answer 1

Correct Answer - C
[Optical of purity (-)MSG `(theta_("observed"))/(theta_("standard"))xx100=83.33%`
RM=100 -optical of purity
=100-83.33=16.66%
(-) MSG total in mixture `rArr` `{:(83.33%),(ul(+8.33%)),(91.66%):}`]