An improved and simplified procedure is described for determining the freezing points of hydrocarbons from time-temperature freezing and melting curves, and for calculating the purity whcn the freezing point for zero impurity is (a) known and (b) not previously known. A procedure for determining the cryoscopic constant is also described. I. II. III. IV. V. VI. VII. VIII.

BACKGROUND The determination of the osmolality of aqueous samples using a freezing point osmometer is a well-established, routine laboratory method. In addition to their use in clinical and pharmaceutical laboratories, freezing point osmometers are also employed in food testing laboratories. One application is the determination of the osmolality of milk. Although cow's milk is a natural product...