Abstract
The solubility products of Cu 2+, Zn 2+, Pb 2+, Cd 2+, Co 2+, Ni 2+, Mn 2+, Hg 2+, Fe 3+, Cr 3+ and Al 3+ soaps of the even linear carboxylic acids C 10 through to C 18 are reported from measurements of the acid ions released from dispersions of the free acid when metal ions are added. Data are given for 25°C and I=0.1 in NaCl electrolyte, and thermodynamic results obtained using the extended Debye-Hückel equation. For all the soaps studied, the negative logarithm of the solubility product is a linear function of the number of carbon atoms in the soap chain. The energetics of soap formation seem to be dominated by the chemistry of the carboxyl group and the solvated metal ion. There is considerable evidence that the solubility product data can be used to predict the relative binding of different metals to any solution interface populated largely by carboxyl groups.
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