XLVI. The dielectric constants of some metallic sulphates containing various amounts of water of crystallization

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Abstract
The dielectric constants of salts with varying amounts of water of crystallization have been measured. Samples of the powdered salt are suspended in a graded series of mixtures of two liquids which give liquid media of different dielectric constants. The mixture is found which has the same dielectric constant as the salt; this is determined by finding experimentally the particular mixture, the dielectric constant of which is not changed by the addition of the powdered salt. The capacity of the condenser cell containing the samples is measured in the circuit of a crystal controlled oscillator of about two megacycles frequency. The molecular polarization of the water in the salts is practically constant and only slightly higher than that of ice. The results indicate that the water molecules retain their integrity as individual molecules bound in much the same manner as those in ice.

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