Ammonia forms the complex ion [Cu(NH_ 3 )_ 4 ]^ 2+ with copper ions...

Ammonia forms the complex ion

\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}

with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Options

AIn acidic solutions protons coordinate with ammonia molecules forming $\mathrm{NH}_{4}^{+}$ ions and $\mathrm{NH}_{3}$ molecules are not available.
BIn alkaline solutions insoluble $\mathrm{Cu}(\mathrm{OH})_{2}$ is precipitated which is soluble in excess of any alkali.
CCopper hydroxide is an amphoteric substance.
DIn acidic solutions hydration protects copper ions.

Correct answer

A. In acidic solutions protons coordinate with ammonia molecules forming $\mathrm{NH}_{4}^{+}$ ions and $\mathrm{NH}_{3}$ molecules are not available.

Step-by-step solution

\quad \mathrm{N} \mathrm{H}_{3}+\mathrm{H}^{+}

(acidic medium)

\rightleftharpoons \mathrm{NH}_{4}^{+}

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