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(D) When ammonia $(NH_3)$ is dissolved in water,it undergoes a reversible reaction to form ammonium hydroxide $(NH_4OH)$,which further dissociates int

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$OH^{-}, NH_4^+,$ and $NH_4OH$ molecules

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(D) When ammonia $(NH_3)$ is dissolved in water,it undergoes a reversible reaction to form ammonium hydroxide $(NH_4OH)$,which further dissociates into ammonium ions $(NH_4^+)$ and hydroxide ions $(OH^-)$.The equilibrium is represented as: $NH_3 + H_2O \rightleftharpoons NH_4OH \rightleftharpoons NH_4^+ + OH^-$.Therefore,the solution contains $NH_4^+$,$OH^-$,and undissociated $NH_4OH$ molecules.

$A$ solution of ammonia in water contains

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$A$ solution of ammonia in water contains

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The values of dissociation constants $(K_a)$ of some acids (at $25\,^{\circ}C$) are as follows. Indicate which is the strongest acid in water:
$(A)$ $1.4 \times 10^{-2}$
$(B)$ $1.6 \times 10^{-4}$
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$HPO_{4(aq)}^{2-} + H_2O_{(\ell)} \rightleftharpoons PO_{4(aq)}^{3-} + H_3O_{(aq)}^{+}$