Collect. Czech. Chem. Commun. 1982, 47, 736-743

Solubility of Na2O2.8 H2O in the system H2O2-NaOH-KOH-H2O

Jan Balej and Otomar Špalek

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


The solubility of Na2O2.8 H2O in the multicomponent system H2O2-NaOH-KOH-H2O has been investigated at temperatures of 12, 20, and 30°C. Comparison of the data with solubilities of the same compound in the simler system H2O2-NaOH-H2) shows that the presence of potassium hydroxide increases the solubility at the same temperature and total content of hydroxide ions. The effect of potassium ions on the solubility of Na2O2.8 H2O is expressed by an empirical equation relating the apparent equilibrium constant of the dissolution reaction and the molalities of the perhydroxyl and potassium ions at a given temperature.