Q. 25

Ionization constant of a weak base MOH, is given by the expression

Kb =

Values of ionisation constant of some weak bases at a particular temperature are given below:

Base Di-methylamine Urea Pyridine Ammonia

Kb 5.4 × 10-4 1.3 × 10-14 1.77× 10-9 1.77 × 10-5

Arrange the bases in decreasing order of the extent of their ionisation at Equilibrium. Which of the above base is the strongest?

Answer :

pKb values for Di-methylamine, ammonia, pyridine and urea are respectively 3.29, 4.752, 8.752, and 13.8861.

The value of Kb (base ionisation constant) defines the strength of a base. Weak bases with relatively higher values are strong that bases with lower kb values.


The decreasing order of bases on the basis of the ionisation constant at Equilibrium will be;-


Di-methylamine > Ammonia > Pyridine > Urea


The strongest base will be Di-methyl amine as its pKb value is 3.29 and we know that the less the pKb value strong is the base.


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