Abstract
The enthalpy of neutralization of hydrochloric acid with sodium hydroxide has been determined at six temperatures between 298 and 418 K using a reaction-solution rotating-bomb calorimeter. The enthalpy of dilution of the hydrochloric acid used was determined at the same temperatures. In order to derive the enthalpy of ionization of water at infinite dilution, ΔH°1, at the respective temperatures the measured enthalpy values were combined with values of enthalpies of dilution calculated from dilution data at 298K and from reported heat capacity values. The resulting ΔH°i values were fitted to a third-order polynomial. Comparisons are made with earlier reported ΔH°1 and ΔC°p values.
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