Chapter 18, Problem 139RQ

When solutions of sodium hydroxide are used to neutralize hydrochloric acid, the standard heat of reaction is found to be –55.86 kJ. When propionic acid ${\text{HC}}_{\text{3}}{\text{H}}_{\text{5}}{\text{O}}_{\text{2}}$ is neutralized with sodium hydroxide the standard heat of the reaction is –49.23 kJ. What is the standard heat and entropy change for the ionization of propionic acid?