1.

Why is ammonium hydroxide used in the qualitative analysis? Give two equations to justify your answer

Answer»

When correct amount of ammonium hydroxide is added drop wise to solutions of the metallic salts, ppts. (colored generally) are formed. They help us to identify their metal ions.

Two equations:

FeSO4 + 2NH4OH → (NH4).2SO4 + Fe (OH)2

(Green) (Dirty green)

shows the presence of Fe+2 ion.

FeCl3 + 3NH4OH  3NH4Cl + Fe (OH)3

(Brown) (Reddish brown)

shows the presence of Fe+3 ion.



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