First slide

Common ion effect

Question

$\large HC{N_{(aq)}}\, \rightleftharpoons \,{H^ + }_{(aq)}\, + \,C{N^ - }_{(aq)}.$ At equilibrium, the addition of CN^- ions would

Easy

A

decrease H⁺ ion concentration
B

reduce HCN concentration
C

increase equilibrium constant
D

decrease equilibrium constant

Solution

$\large HC{N_{(aq)}}\, \rightleftharpoons \,{H^ + }_{(aq)}\, + \,C{N^ - }_{(aq)}.$
Addition of CN^- increases product concentration.
Thus backward reaction is favoured, [H⁺] decreases.

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