The solubility of precipitated Cd(OH)2 was determined at 25°C in 1 M NaClO4, as a function of pH and of the ammonia content of the solutions. Formation constants were obtained for the following hydroxo, ammine and hydroxo‐ammine complexes: CdOH+, Cd(OH)2, Cd(OH) 2−4, CdNH 2+3, Cd(NH3) 2+2, Cd(NH3) 2+3, Cd(NH3) 2+4 and Cd(OH)2NH3. The solubility product of the hydroxide was also calculated.
The presence of polynuclear species was investigated by titrimetric determinations of the hydrogen ion concentration at constant metal concentration.