Answer to Question #86241 in Physical Chemistry for Ra

Question

What is the equation used in the Rast method of determination of relative molecular mass and the significance of the terms involved?

Answer 1

The Rasta method uses camphor as a solvent to determine molar masses. Camphair melts at 178.4 ° C, and its large Kf (37.7 kg kg mole-1) makes it particularly useful for accurate work. A sample of an unknown substance of a certain mass reduces the freezing point of 20.0 g of camphor to 175.9 ° C.