Answer:
\[C{{u}^{2+}}(aq)+2\,O{{H}^{-}}\,(aq)\xrightarrow{\,}\,\underset{\text{pale}\,\,\text{blue}\,\,\text{ppt}\text{.}}{\mathop{Cu{{(OH)}_{2}}(s)}}\,\]
\[Cu{{(OH)}_{2}}\,(s)+4N{{H}_{3}}\,(aq)\xrightarrow{{}}\]\[\underset{\text{deep}\,\,\text{blue}}{\mathop{{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}}}\,\,(aq)+2O{{H}^{-}}\,(aq)\]
\[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\,(aq)+\underset{\text{(acidic)}}{\mathop{4\,{{H}_{3}}{{O}^{+}}}}\,\xrightarrow{\,}\]\[\underset{\text{pale}\,\,\text{blue}\,\,\text{solution}}{\mathop{{{[Cu{{(OH)}_{4}}]}^{2+}}}}\,+4\,NH_{4}^{+}\
(aq)\]
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