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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?
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In acidic solutions protons coordinate with ammonia molecules forming $\mathrm{NH}_4^{+}$ions and $\mathrm{NH}_3$ molecules are not available
In acidic solutions protons coordinate with ammonia molecules forming $\mathrm{NH}_4^{+}$ions and $\mathrm{NH}_3$ molecules are not available
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