In chemistry and biochemistry the dissociation constant, abbreviated Kd, is a measure of the extent to which a dissociation reaction
proceeds at equilibrium.
It is given quantitatively by the expression
Where [A], [B], and [AB] indicate the concentrations of A, B, and AB, respectively.
See also hydrogen bond.
The dissociation constant is a specific type of equilibrium constant[?].
The dissociation constant of water (Ke) varies in function of the temperature. The value of pH for neutrality is not the same at different temperatures.
water | Ke | pKe |
0°C | 0.1e-14 | 14.92 |
10°C | 0.3 | 14.52 |
18°C | 0.7 | 14.16 |
25°C | 1.2 | 13.92 |
30°C | 1.8 | 13.75 |
50°C | 8 | 13.10 | 60°C | 12.6 | 12.90 |
70°C | 21.2 | 12.67 |
80°C | 35 | 12.46 |
90°C | 53 | 12.28 |
100°C | 73 | 12.14 |
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