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

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Experiment 14

OBJECT

To determine the solubility of a given salt at room temperature and also to draw its solubility curve.

APPARATUS

Thermostat, beakers, stirrer, thermometer etc.

THEORY

The solubility of the salt is determined by preparing its saturated solution at a number of temperatures, and then a curve is plotted between the solubility as ordinate and temperature as abscissa.

PROCEDURE

Take about 50 ml of distilled water in a beaker and add to it some amount of the given salt, say KCl and stir the contents. Now, heat the solution to about 85–90 °C and go on adding a large amount of the salt. Please note that the salt should be in excess at 85–90 °C. Now, cool the solution and as the temperature falls to say 80 °C, pipette out about 4–5 ...

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