Aqueous iodic acid: Conductance and thermodynamics

Precision conductance measurements are reported on aqueous solutions of iodic acid for 16 concentrations between 17 and 0.7 mM and for 20 temperatures between 5° and 100°C. RlnK_a(m) and _o were calculated at each temperature and the data expressed by suitable temperature functions. From RlnK_a(m) as a function of temperature changes in standard enthalpy, entropy, and heat capacity were calculated. C_p proved to be independent of temperature so that H⁰ was a linear function of temperature. Comparisons have been made with other published data for iodic acid. The pattern of variation of Walden products with temperature was similar to that found earlier for substituted benzoic acids.