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Zinc Ion

Sodium hydrox...

Question

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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Q. The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
(b) Iron (II) sulphate
(c) Iron (III) chloride
(d) Lead nitrate
(e) Magnesium sulphate
(f) Zinc chloride

(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q. The questions (i) to (v) refer to the following salt solutions listed A to F:
A. Copper nitrate
B. Iron (II) sulphate
C. Iron (III) chloride
D. Lead nitrate
E. Magnesium sulphate
F. Zinc chloride
(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q. Sodium hydroxide solution is added to the solutions containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates.

List X	List Y
(i) Pb²⁺	(A) Reddish brown
(ii) Fe²⁺	(B) White insoluble in excess
(iii) Zn²⁺	(C) Dirty green
(iv) Fe³⁺	(D) White soluble in excess
(v) Cu²⁺	(E) White soluble in excess
(vi) Ca²⁺	(F) Blue

Q. Using sodium hydroxide solution, how would you distinguish:
(a) Ammonium sulphate from sodium sulphate.
(b) Zinc nitrate solution from calcium nitrate solution.
(c) Iron (II) chloride from Iron (III) chloride.

Q. An aqueous solution of a gas (X) shows the following reactions :
(i) It turns red litmus blue
(ii) When added in excess to a copper sulphate solution, a deep blue colour is obtained.
(iii) On addition to a ferric chloride solution, a brown precipitate, soluble in dilute nitric acid, is obtained.

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