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Sulphuric Acid

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Question

What happens when ammonium hydroxide is added in excess in copper chloride solution?

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Solution

When ammonium hydroxide is added in excess in copper chloride solution, first a precipitate of cupric hydroxide is formed which then redissolves forming tetrammine copper (II) chloride.
$C u C l_{2} + 2 N H_{4} O H \to C u (O H)_{2} ↓ + 2 N H_{4} C l$
$C u (O H)_{2} + 4 N H_{4} C l \to [C u (N H_{3})_{4}] \cdot 2 C l + 2 H_{2} O + 2 H C l$

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