Question
Ionisation constant of a weak base MOH, is given by the expression.
Arrange the bases in decreasing order of the extent of their ionisation at equilibrium. Which of the above base is the strongest?
$\text{K}_\text{b}=\frac{[\text{M}^+][\text{OH}^-]}{[\text{MOH}]}$
Values of ionisation constant of some weak bases at a particular temperature are given below:| Base | Dimethylamine | Urea | Pyridine | Ammonia |
| Kb | 5.4 × 10–4 | 1.3 × 10–14 | 1.77 × 10–9 | 1.77 × 10–5 |