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Carbonates

Solution A is...

Question

Solution A is a sodium hydroxide solution. Solution B is a weak acid. C is dilute sulphuric acid. Which solution will
(i) liberate sulphur dioxide from sodium sulphite,
(ii) give a white precipitate with zinc sulphate solution,
(iii) contain solute molecules and ions?

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Solution

(i) Solution C liberates sulphur dioxide from sodium sulphite. Sodium sulphite on reaction with dilute sulphuric acid produces sodium sulphate salt and liberates sulphur dioxide gas.
Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂

(ii) Solution A gives a white precipitate with zinc sulphate solution. Sodium hydroxide reacts with zinc sulphate to form a white precipitate of zinc hydroxide.
ZnSO₄ + 2NaOH → Zn(OH)₂ + Na₂SO₄

(iii) Solution B contains both solute and water molecules because a weak acid ionises partially.

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Similar questions

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. (a) Sodium hydroxide solution can be used to distinguish between (i) Iron (II) sulphate solution and (ii) iron (III) sulphate solution; because these solutions give different coloured precipitates with sodium hydroxide solution. Give the colour of the precipitate formed with each of the solution.
(b) What will you observe when barium chloride solution is added to iron (II) sulphate solution?
(c) How will the action of dilute hydrochloric acid on sodium carbonate and sodium sulphite enables you to distinguish between these two compounds?

Q. Write the equations for the reaction of zinc with each of the following:
(a) sodium hydroxide solution.
(b) dilute sulphuric acid.
(c) copper sulphate solution.

Q. Write balanced equations for the following reactions:
(i) Iron (II) chloride solution with sodium hydroxide solution.
(ii) Chlorine and cold dilute sodium hydroxide solution.
(iii) Zinc and sodium hydroxide solution.
(iv) Sulphur dioxide and sodium hydroxide solution.
(Give the equation for the formation of the normal salt).

Q. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide

+

\to

Zinc oxide solid

+

Sulphur dioxide gas
ii) Silver nitrate solution

+

Sodium chloride solution

\to

Silver chloride precipitate

+

Sodium nitrate solution
iii) Sulphur solid

+

Concentrated nitric acid

\to

+

Nitrogen dioxide gas

+

Water
iv) Barium chloride Solution

+

Potassium sulphate Solution

\to

Barium sulphate Precipitate

+

Potassium chloride solution
v) Silver nitrate on heating

\to

+

nitrogen dioxide gas

+

Oxygen gas.
vi) Aluminium hydroxide

+

\to

Aluminium nitrate

+

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