Enthalpies of mixing of simple electrolyte solutions with sodium carboxymethylcellulose

Abstract

The enthalpies of mixing have been determined for the reaction between aqueous solutions of two samples of sodium carboxymethylcellulose with different degrees of substitution and aqueous solutions of lithium chloride, sodium chloride, and potassium chloride. The effect of temperature on the enthalpy of mixing has also been investigated. The results are compared with the predictions of the line-charge theory. Mixing solutions containing lithium and sodium ions gives an additional endothermic contribution to the reaction, while mixing solutions containing potassium and sodium ions gives an additional exothermic contribution to the reaction.