Apparent molar volumes and apparent molar heat capacities of aqueous KI, HIO3, NaIO3, and KIO3 at temperatures from 278.15K to 393.15K and at the pressure 0.35MPa

We determined apparent molar volumes Vϕ at 298.15 ⩽ (T/K) ⩽ 368.15 and apparent molar heat capacities Cp,ϕ at 298.15 ⩽ (T/K) ⩽ 393.15 for aqueous solutions of HIO3 at molalities m from (0.015 to 1.0) mol · kg−1, and of aqueous KIO3 at molalities m from (0.01 to 0.2) mol · kg−1 at p = 0.35 MPa. We also determined Vϕ at the same p and at 298.15 ⩽ (T/K) ⩽ 368.15 for aqueous solutions of KI at m from (0.015 to 7.5) mol · kg−1. We determined Cp,ϕ at the same p and at 298.15 ⩽ (T/K) ⩽ 393.15 for aqueous solutions of KI at m from (0.015 to 5.5) mol · kg−1, and for aqueous solutions of NaIO3 at m from (0.02 to 0.15) mol · kg−1. Values of Vϕ were determined from densities measured with a vibrating-tube densimeter, and values of Cp,ϕ were determined with a twin fixed-cell, differential temperature-scanning calorimeter. Empirical functions of m and T were fitted to our results for each compound. Values of Ka, ΔrHm, and ΔrCp,m for the proton ionization reaction of aqueous HIO3 are calculated and discussed.