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When ammonia is added to pure water, the concentration of which of the following species already present, will decrease

(a) $O^{2-}$

(b) $OH^-$

(c) $H_3O^+$

(d) $NH_4^+$

1 Answer

Answer: $H_3O^+$
In pure water, there is an equilibrium
$H_2O + H_2O \rightleftharpoons H_3O^+ + OH^-$
Addition of Ammonia disturbs this equilibrium because $NH_3$ reacts with $H_3O^+$ ions as
$NH_3 + H_3O^+ \rightleftharpoons NH^+_4 + H_2O$


answered Nov 23, 2013 by mosymeow_1

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