Ionization constants of benzoic acid from 25 to 250°C and to 2000 bar |
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Authors: | A J Read |
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Institution: | (1) Chemistry Division, Department of Scientific and Industrial Research, Private Bag, Petone, New Zealand |
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Abstract: | The ionization constant of benzoic acid has been determined by conductivity measurements of dilute aqueous solutions and found to vary from 6.27×10–5 at 25°C to 0.39×10–5 at 250°C. The pressure effect to 2000 bar has been measured, and the ratio of ionization constants K2000/K1 is 2.26 at 25°C and 7.3 at 250°C. V°1, the standard partial molar volume change for the ionization at 1 bar, varies from –11.7 cm3-mol–1 at 25°C to –60 cm3-mol–1 at 250°C. The volume changes are smaller at higher pressures. |
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Keywords: | Ionization constant benzoic acid conductivity volume of ionization high temperature high pressure |
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