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.