91影视

The observed rotation can be used to calculate the specific rotation at a given temperature and wavelength using the formula-

[饾灙] = 饾灙/ l c

where [饾灙] is the specific rotation,

T is the temperature in degrees Celsius,

l is the wavelength of the incident light (when the sodium D-line is used, l is indicated as D),

蓱 is the observed rotation,

l is the length of the sample tube in decimetres, and

c is the sample concentration in grams per 100 milliliters.

specific rotation of (+)-Mandelic acid = +158

Concentration of (-) Mandelic acid = 50

Concentration of (+) Mandelic acid = 50

Since, it is a racemic mixture, therefore specific rotation of racemic mixture of MSG is 0.

A racemic mixture is an equal mix of two enantiomers with a specific rotation of 0 degrees (Optically Inactive).

Concentration of (-) Mandelic acid = 25

Concentration of (+) Mandelic acid = 75

Therefore, excess of (+) mandelic acid = 75-25= 50%

Enantiomeric excess =脳 100%

50 = (x/158) 脳 100

X = +79

Concentration of (-) Mandelic acid = 75

Concentration of (+) Mandelic acid = 25

Therefore, excess of (-) mandelic acid = 75-25= 50%

Enantiomeric excess = (Observed specific rotation) / (Specific rotation of (+) enantiomer) 脳 100%

50 = (x/158) 脳 100

X = -79