Apparatus for Determining the Partial Equivalent Volumes of Salts in Aqueous Solutions

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Abstract
An apparatus for determining partial equivalent volumes of salts in aqueous solutions is described. Using a cathetometer and a specially designed dilatometer, treated with an organic silicone fluid, the change in volume of a solution due to the addition of a small increment of salt is measured directly. The partial equivalent volume is determined by extrapolating the volume increments to zero salt addition. Results of the determination of the partial equivalent volume of sodium chloride in distilled water at 0.80°C are presented. Also, preliminary results for potassium chloride, sodium chloride, potassium sulfate, and sodium sulfate in sea water are discussed.

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