Specific interactions from individual ion activity coefficients of Ag(I) and Ca(II) ions in aqueous sulphuric acid

Abstract

Activity coefficients of Ag⁺ and Ca²⁺ ions have been calculated at different ionic strengths from the solubilities of Ag₂SO₄ and CaSO₄ in aqueous H₂SO₄, those for SO ion being obtained from previous work. These values can be used to predict the solubilities of these salts in other aqueous electrolytes. A comparison with the experimental results in aqueous NaNO₃ (for Ag₂SO₄) and aqueous NaCI (for CaSO₄) suggests that, unlike Ag⁺, Ca²⁺ undergoes specific interaction with HSO<img src='http://www.niscair.res.in/jinfo/Subscript4.gif' border=0> / SO<img src='http://www.niscair.res.in/jinfo/four1.gif' border=0>.