Abstract
Abstract Heat capacity of a polystyrene sulfonate ion-exchanger has been investigated with a TIAN-CALVET microcalorimeter as a function of the water content. Three ionic forms K + , Na + and Ba 2+ were examined. The partial molar heat capacity of water has been then deduced. The observed variations may be explained by the presence of strong interactions between water and ion-exchanger. The hydratation proceeds by way of two steps. The counter-ion charge density is the main factor.
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