Solubility of sodium and potassium iodates in saturated salt solutions

The determination of the solubilities of KIO3 and NaIO3 in saturated NaCl solution at 0, 10, 20 °C were carried out in two ternary systems KIO3–NaCl–H2O and NaIO3–NaCl–H2O. Saturated KIO3 and NaIO3 solutions were prepared and NaCl was added to saturation. Iodate concentrations were measured using standardized sodium thiosulphate. The solubilities of KIO3 and NaIO3 are temperature sensitive over the range 0 °C to 20 °C (unlike NaCl). Iodate solubility was much lower in saturated NaCl than that of deionised water. In saturated NaCl at 10 °C, for example, NaIO3 was 19% and KIO3 was 15% the solubility of that found in deionised water at the same temperature.