Abstract

The temperature of initial crystallization T H and the supersaturation values of KCl solutions crystallizing in the presence of lead ions were determined by recording the cooling curves in the temperature range 60 to 31.5 °C. A simple relation between the supersaturation at the crystallization point S H and the concentration of the Pb 2+ ions in the solutions was established (eq. (3)). The amount of co-precipitated lead was also determined for some of the experiments. The great variety of observed phenomena is explained by assuming the distribution of the supersaturation in stable macro-molecular nuclei formed around a central lead ion.

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