How will you distinguish between Ammonium hydroxide and Sodium hydroxide using copper sulphate solution?

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Solution

Copper sulphate forms a precipitate that is soluble in excess of ammonium hydroxide.
$C u S O_{4} + 2 N H_{4} O H \to C u (O H)_{2} ↓ + (N H_{4})_{2} S O_{4}$
$C u (O H)_{2} + 4 N H_{4} O H (excess) \to [C u (N H_{3})_{4}] (O H)_{2} Cuprammine hydroxide (water soluble) + 4 H_{2} O$
Copper sulphate forms a precipitate that is insoluble in excess ofsodium hydroxide.
$C u S O_{4} + 2 N a O H \to C u (O H)_{2} ↓ + N a_{2} S O_{4}$

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