The dissociation constant of acetic acid in water is between 4 and 26% greater at the solution vapour pressure than at one atmosphere in the range 250 to 374°C. K=ƒ(T)S.V.P. corresponds to neither the isobaric nor isochoric conditions, and the error introduced by neglecting the effect of the vapour pressure on the equilibrium at high temperatures is discussed.
D. A. Lown and H. R. Thirsk, J. Chem. Soc., Faraday Trans. 1, 1972, 68, 1982 DOI: 10.1039/F19726801982
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