Question

Consider the reaction
$HCN\left(aq\right)\rightleftharpoons H^{+}\left(aq\right)+C{N}^{-}\left(aq\right)$ , At equilibrium, the addition of $C{N}^{-}\left(aq\right)$ would

• A. Reduce $HCN\left(aq\right)$ concentration
• B. Decrease the $H^{+}\left(aq\right)$ ion concentration
• C. Increase the equilibrium constant
• D. Decrease the equilibrium constant

Answer 1

The correct option is B Decrease the $H^{+}\left(aq\right)$ ion concentration

According to Le-chatelier's principle, At equilibrium, the addition of $(CN{)}^{-}$would decrease the $\left(H^{+}\right)$ion concentration to produce more and more HCN to nullified the increase of
$C{N}^{-}\left(aq\right)$
.