Using the values for the equilibrium constant for the ionization of water in Table 13.5-1, estimate the standard-state heat of ionization of water as a function of temperature. Also, determine the pH of water at each of the temperatures in this table.

Table 13.5-1

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T (°C) 0 10 20 25 30 40 50 60 Ka,w 1.15 x 10-15 2.88 x 10-15 6.76 × 10-15 1.00 x 10-14 1.48 × 10-14 x 2.88 x 10-14 5.50 x 10-14 9.55 x 10-14 pKw 14.94 14.54 14.17 14.00 13.83 13.54 13.26 13.02