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Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solution of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to (x).
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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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) Pale blue precipitate
(ii) White gelatinous precipitate
(iii) White precipitate
(iv) White precipitate.
(v) Reddish brown precipitate
(vi) Insoluble
(vii) Soluble
(viii) Soluble
(ix) Insoluble (sparingly soluble)
(x) Insoluble

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