What do you observe when ammonia hydroxide is added to the aqueous solution of :

(a) $F e S O_{4}$ , (b) Iron (III) chloride,

(c) Lead nitrate, (d) Zinc nitrate ?

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Solution

(a) $F e S O_{4}$ + 2 $N H_{4} O H$ $\Rightarrow$ $(N H_{4})_{2} S O_{4}$ + $F e (O H)_{2}$
A dull green precipitate of ferrous hydroxide is formed.

(b) $F e C l_{3}$ +3 $N H_{4} O H$ $\Rightarrow$ 3 $(N H_{4}) C l$ + $F e (O H)_{3}$
With ferric chloride ammonia forms brown precipitate of ferric hydroxide.

(c) $P b (N O_{3})_{2}$ + 2 $N H_{4} O H$ $\Rightarrow$ $P b (O H)_{2}$ + 2 $N H_{4} N O_{3}$
White precipitate of lead(II) hydroxide is formed.

(d) $Z n (N O_{3})_{2}$ + 2 $N H_{4} O H$ $\Rightarrow$ 2 $N H_{4} N O_{3}$ + $Z n (O H)_{2}$
A white precipitate of zinc hydroxide is formed.
This dissolves in excess ammonium hydroxide.
$Z n (O H)_{2}$ + 4 $N H_{4} O H$ $\Rightarrow$ $[Z n (N H_{3})_{4}] (O H)_{2}$ + 4 $H_{2} O$

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Similar questions

What do you observe when ammonia hydroxide is added to the aqueous solution of :

(a) $F e S O_{4}$ , (b) Iron (III) chloride,

What do you observe when

(a) dilute sulphuric acid is added to granulated zinc ?

(b) a few pieces of iron are dropped in a blute solution of sodium chloride ?

(d) ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.

(e) solid lead nitrate is heated ?

(f) when dilute sulphuric acid is added to barium chloride solution ?

Aqueous salt Solution	Colour of precipitate when NaOH is added in a small quantity	Nature of precipitate (soluble or insoluble) when NaOH is added in excess
Copper (II) sulphate Zinc nitrate Lead nitrate Calcium chloride Iron (III) sulphate	(i) (ii) (iii) (iv) (v)	(vi) (vii) (viii) (ix) (x)

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