Mean Activity Coefficients of Peroxodisulfates and Sulfates in Saturated Polycomponent Solutions
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Abstract: Activity coefficients of sodium, potassium and ammonium peroxodisulfate and sulfate in aqueous saturated polycomponent solutions at 0 – 40 °C have been derived on the basis of the thermodynamic equilibrium condition between the solid substance and its saturated solution on one hand, and on the correlation equations for the appropriate solubility data on the other hand. A good agreement between the results of both methods with maximum differences of only a few thousandths has been found. The following ternary systems without solid solutions have been treated: Na2S2O8-Na2SO4-H2O, K2S2O8-K2SO4-H2O, (NH4)2S2O8-(NH4)2SO4-H2O, Na2S2O8-NaOH-H2O, K2S2O8-KOH-H2O, Na2S2O8-K2S2O8-H2O, Na2S2O8-(NH4)2S2O8-H2O, Na2S2O8-H2SO4-H2O, K2S2O8-H2SO4-H2O, (NH4)2S2O8-H2SO4-H2O, and quaternary systems (NH4)2S2O8-(NH4)2SO4-H2SO4-H2O, Na2S2O8-Na2SO4-H2SO4-H2O and (NH4)2S2O8-Na2S2O8-H2SO4-H2O.
Keywords: Activity coefficient, Sodium peroxodisulfate, Potassium peroxodisulfate, Ammonium peroxodisulfate, Sodium sulfate, Potassium sulfate, Ammonium sulfate
Full paper in Portable Document Format: acs_0083.pdf
Acta Chimica Slovaca, Vol. 4, No. 1, 2011, pp. 78—94