Isotope Effects
Heavy water, D2O, self-ionizes less than normal water, H2O; oxygen forms a slightly stronger bond to deuterium because the larger mass of deuterium difference results in a lower zero-point energy, a quantum mechanical effect. The following table compares the values of pKw for H2O and D2O.
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pKw values for pure water T/°C 10 20 25 30 40 50 H2O 14.535 14.167 13.997 13.830 13.535 13.262 D2O 15.439 15.049 14.869 14.699 14.385 14.103
Read more about this topic: Self-ionization Of Water
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