Dissociation constant of sorbic acid in water and water‐glycerol mixtures at 25°C from conductance measurements

Summary Molar conductivities of dilute solutions of sorbic acid in water, and in the mixed solvents water +lo, 20,30,40 and 50% glycerol by mass at 25°C are reported. The results have been analysed with the Pitts conductance equation and pK, values for sorbic acid in these solvent mixtures are tabulated. Similar data for sorbic acid in water+30% glycerol at 10°C are also included. The implications of the results for the role of sorbic acid in food preservation are discussed.