Synthesis, thermal investigations and solubility of a new double salt K2Mg(IO3)4·2H2O

Article abstract of DOI:10.1016/s0040-6031(96)03115-2

A new double salt K₂Mg(IO₃)₄·2H₂O has been synthesized. Its thermal and calorimetric behaviors were investigated by the DTA, TG and DSC methods. A mechanism of thermal decomposition has been suggested. The Δ_fH⁰₂₉₈ was calculated from the recorded ΔH⁰ of the DSC curve. The data from the TG curves were processed by the methods of formal kinetics involving the calculation of the kinetic parameters E* and Z, and the type of the kinetic equation determined. The solubility of K₂Mg(IO₃)₄·2H₂O in water was investigated in the 20-50°C temperature interval. The value of Δ_dissolH⁰₂₉₈ was calculated on the basis of the solubility data, whence the value of Δ_fH⁰₂₉₈ of the double salt was calculated. The values of Δ_fH⁰₂₉₈, determined by the two methods, were compared.