The following data give the ion product, KW (see Equation 2.6b on page 39), for water at various temperatures:
T(°C) | Kw (m2) |
0 | 1.14 × 10−15 |
25 | 1.00 × 10−14 |
30 | 1.47 × 10−H |
37 | 2.56 × 10−14 |
(a) Using the results from Problem 10, calculate ΔH° for the ionization of water.
(b) Use these data, and the ion product at 25 °C, to calculate ΔS° for water ionization (hint: use the chemical standard state for the activity of water rather than that for the biochemical standard state activity of water).
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