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Question
Why some metallic hydroxides are soluble in excess of ammonium hydroxide? Explain with a reaction involved.
Explain
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Solution
Some metallic hydroxides are soluble in excess ammonium hydroxide because they react with ammonium hydroxide to form soluble complex ions.
Example: Zinc hydroxide dissolves in excess ammonium hydroxide to form a soluble complex.
\[\ce{Zn(OH)2 + 4NH4OH → [Zn(NH3)4](OH)2 + 4H2O}\]
Thus, Zn(OH)2 dissolves in excess NH4OH due to the formation of a soluble complex.
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