# Answer the following : The dissociation of HCN is suppressed by the addition of HCl. Explain. - Chemistry

The dissociation of HCN is suppressed by the addition of HCl. Explain.

#### Solution

i. HCN and HCl both dissociate to produce H+ ions which are common to both.

ii. HCN is a weak electrolyte. It dissociates to a little extent.

$\ce{HCN_{(aq)} ⇌ H^+_{ (aq)} + CN^-}$

iii. HCl is a strong electrolyte. It undergoes complete dissociation.

$\ce{HCl_{(aq)} -> H^+_{ (aq)} + Cl^-_{ (aq)}}$

Both HCN and HCl provide H+ ions.

iv. The concentration of H+ ions in the solution increases due to the complete dissociation of HCl.

v. According to Le-Chatelier’s principle, the effect of the stress (the addition of H+ ions from HCl) applied to the ionization equilibrium of HCN is reduced by shifting the equilibrium in the backward direction.

vi. H+ ions combine with "CN"^- ions to produce unionized HCN. Thus, the dissociation of HCN is suppressed by the addition of HCl.

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#### APPEARS IN

Balbharati Chemistry 12th Standard HSC for Maharashtra State Board
Chapter 3 Ionic Equilibria
Exercise | Q 4.04 | Page 62