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Item Effect of the Solution Vapour Pressure on the Temperature Dependence of the Dissociation Constant of Acetic Acid in Water(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (10), 1972) Lown, D. A.; Thirsk, H. R.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 = /(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.