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CBSE Class 10 Answered

Why is it that weak acids and weak bases do not completely ionize when dissolved in water while strong acids and strong bases do? Please explain the reason in detail
Asked by kumar.ashlesha | 18 Jun, 2015, 04:52: PM
answered-by-expert Expert Answer

In case of weak acid some molecules are dissociating into ions; some ions are recombining to form molecules. Due to which in the ionization of a weak acid there are fewer ions than molecules.

For example: Ionisation of acetic acid,

begin mathsize 11px style CH subscript 3 COOH space leftwards harpoon over rightwards harpoon space straight H to the power of plus space plus space CH subscript 3 COOH to the power of straight _ end style

In case of strong acid there is no recombination so we can observe complete ionisation.

For example: Ionisation of nitric acid,

begin mathsize 11px style HNO subscript 3 space leftwards harpoon over rightwards harpoon space straight H to the power of plus space plus space NO subscript 3 superscript minus end style

Answered by Arvind Diwale | 19 Jun, 2015, 12:10: PM

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