how is NH4OH is used as a laboratory reagent

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Solution

Ammonium hydroxide is used as a lab reagent especially in the qualitative analysis. The particular cation in the salt can be identified through the formation of the hydroxide precipitate colour.
Metallic salt + NH₄OH ----> Metal hydroxide + ammonium salt
$F o r e x ., F e S O_{4} + 2 N H_{4} O H \to (N H_{4})_{2} S O_{4} + F e (O H)_{2} T h e f o r m a t i o n o f d i r t y g r e e n h y d r o x i d e i n d i c a t e s t h e p r e s e n c e o f f e r r o u s . C u S O_{4} + 2 N H_{4} O H \to (N H_{4})_{2} S O_{4} + C u (O H)_{2} T h e f o r m a t i o n o f p a l e b l u e h y d r o x i d e i n d i c a t e s t h e p r e s e n c e o f c o p p e r .$

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