Question #86241
What is the equation used in the Rast method of determination of relative molecular mass and the significance of the terms involved?
Expert's answer
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.
