Association and hydration equilibria in concentrated aqueous solutions containing magnesium nitrate. Part 1. Cadmium(II) chloride complexes in aqueous solutions of magnesium nitrate and its mixtures with ammonium nitrate

Abstract

Association constants K₁ and K₂ for the formation of CdCl⁺ and CdCl₂ respectively have been evaluated from electromotive force measurements of a concentration cell with Ag–AgCl electrodes. Solutions of Mg(NO₃)₂ containing water (8.5–12.96 mol) and NH₄NO₃–Mg(NO₃)₂(7:3) containing water (2.12–4.86 mol) are used as solvents. The dependence of the formation constant, K₁, on water concentration in the solvents is predictable from calculations based on the quasi-lattice concept of aqueous melts.