Determinations of freezing point constant of a solvent using Rast’s method.

Rast’s method of determining the freezing point constant of a solvent

This is based on the use of melted camphor as a solvent because it has un usually high cryoscopic constant. An ordinary  (360 degree) thermometer is used instead of Beckmann’s thermometer.

1. The freezing point of M₁ g of the pure solvent T₁, is determined.
2. A given mass of solute m₂ is introduced into the solvent  stirred until completely dissolved  and freezing point (T₂) is determined

Treatment of results

Mass of solvent                                                = M₁

Mass of solute                                                 = m₂

∆t                                                                       = (T₁-T₂)

Molecular mass of solute                               = Mr

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