Abstract

An equation has been derived describing the logarithmic distribution coefficient in coprecipitation as a function of the rate of precipitation, the number of growing crystals, and two rate constants, the ratio of which is the distribution coefficient at zero rate of precipitation. In the system lead sulphate-barium sulphate, the derived equation adequately describes the precipitation rate-dependence of the distribution coefficient. The distribution coefficient at zero precipitation rate is 0.010, which agrees satisfactorily with the value predicted from the solubility product constants.

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