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Dissociation constant
In chemistry and biochemistry the dissociation constant, abbreviated Kd, is a measure of the extent to which a dissociation reaction
- AB ↔ A + B
proceeds at equilibrium.
It is given quantitatively by the expression
- Kd = [A]×[B]×[AB]-1
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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