Heat capacities, volumes, and expansibilities of sodium phenyl carboxylates in water

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Abstract
The heat capacities per unit volume at 25 °C and densities from 10 to 55 °C of sodium phenyl carboxylates were measured with a flow microcalorimeter and a flow densimeter. The apparent molal heat capacities and volumes were used to derive standard partial molal heat capacities [Formula: see text], volumes [Formula: see text], and expansibilities [Formula: see text]. The CH2 contribution to [Formula: see text] is the same as that usually observed for aliphatic solutes but the contribution to [Formula: see text] and [Formula: see text] is not constant and significantly different. No simple explanation can be offered for this anomaly.

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