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Pharmaceutical Physical Chemistry: Theory and Practices by S. K. Bhasin

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Experiment 2

OBJECT

To find out the specific rotation and molecular rotation of cane sugar polarimetrically.

APPARATUS

Polarimeter, thermometer, beakers, measuring flasks, sodium lamps.

THEORY

The specific rotation of cane sugar is obtained from the Eq. (2.1). The cane sugar concentration is obtained by interpolating its optical rotation in the calibration curve drawn between rotation and concentration with a series of solutions of known concentrations. The molecular rotation is obtained from Eq. (2.2), where M represents the molecular mass of cane sugar (342).

PROCEDURE

Switch on the sodium lamp half an hour before starting the experiment. Now, prepare 20% (w/v) of cane sugar solution in water by taking accurately 50 g of cane sugar in a 250 ...

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