Zinc Hydroxide: Solubility Product and Hydroxy-complex Stability Constants from 12.5–75 °C

Abstract

We have made atomic absorption measurements leading to the solubility of zinc hydroxide at 12.5, 25.0, 50.0, and 75.0 °C from pH = 6.7 to pH = 13.8. Results have been used for evaluation of the solubility product and stepwise constants for association of Zn2+(aq) with OH− (aq) to form solute species of type Zn(OH)i2−i(aq) with i = 1–4. Evidence is presented to support the reliability of the various equilibrium constants. Uncertainties in derived enthalpies are assessed.