Apparent molar volumes V_φ and apparent molar heat capacities C_p,φ have been determined for aqueous solutions of phenol (C₆H₅OH) and its sodium salt (C₆H₅ONa) at temperatures T from 278.15 to 393.15 K, at the pressure 0.35 MPa, and at molalities m from 0.025 to 0.50 mol·kg⁻¹. We used a vibrating tube densimeter (DMA 512P, Anton PAAR, Austria) to determine the densities and volumetric properties, and a twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetry Sciences Corporation, American Fork, UT, USA) to obtain the heat capacities. Infinite dilution partial molar volumes V₂⁰ and heat capacities C⁰_p,2 were obtained over the range of temperatures by extrapolation to m=0 mol·kg⁻¹ on the fitted surfaces (V_φ,T,m) and (C_p,φ,T,m). Our results were combined with values of V_φ and C_p,φ from the literature for NaCl(aq), HCl(aq), and NaOH(aq) to obtain (Δ_rV_m,T,m) and (Δ_rC_p,m,T,m) for the proton dissociation reaction of C₆H₅OH(aq). Surfaces representing (Δ_rH_m,T,m), (pQ_a,T,m), and (Δ_rS_m,T,m) where created by integration of our (Δ_rC_p,m,T,m) surface using values for (Δ_rH_m,m) and (pQ_a,m) at T=298.15 K from the literature as integration constants.