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Estimated standard formation enthalpies and standard entropies of solid sodium and ammonium peroxodisulfate enabled to estimate standard Gibbs formation energies of these substances in the solid state at 25 °C. Their reliability was checked on the basis of the thermodynamic condition for the equilibrium between the solid substance and its saturated solution, in combination with estimated mean activity coefficients of the saturated solutions and with reliable data of standard Gibbs formation energies in the aqueous solutions. Using suitable estimation methods for the temperature dependence of the appropriate  C ° p  data, the corresponding values Δ f  H ° and Δ f  G ° of sodium, potassium and ammonium peroxodisulfates in the standard solid and aqueous state at 0–50 °C have been derived.

Estimation of Lacking Standard Thermodynamic Data of Peroxodisulfates at 0–50 °C