Question

The salt whose aqueous solution will turn blue litmus to red is
(a) ammonium sulphate
(b) sodium acetate
(c) sodium chloride
(d) potassium carbonate

Answer 1

Answer:

Ammonium Sulphate turns blue litmus to red.

Explanation:

Ammonium Sulphate is an acidic salt so it acts as an acid and turns the blue litmus turns red.

Ammonium sulphate is formed by the reaction of Ammonium hydroxide ( a weak base) and Sulphuric acid ( a strong acid). When Ammonium Sulphate dissociates in water it forms more hydronium ions than hydroxide ions owing to the strong hydrochloric acid present.

Answer 2

Answer:

The salt whose aqueous solution will turn blue litmus to red is Ammonium Sulphate.

Explanation:

• Reaction of strong acid and weak base gives out an acidic salt.
• The Ammonium Sulphate i.e $(NH_{4} )_{2} SO_{4}$  is the formed from the combination of a weak base ammonium hydroxide i.e $NH_{4}OH$  and a strong acid sulphuric acid i.e $H_{2}SO_{4}$ .

• The reaction to it is as follows:

           $NH_{4} OH + H_{2} SO_{4} \rightarrow(NH_{4} )_{2} SO_{4} + H_{2} O$

• On dissolving in water, $(NH_{4} )_{2} SO_{4}$  produces more  $H^{+}$ ions as compared to $OH^{-}$ ions , turning the aqueous solution acidic.
• Hence, when we perform litmus test, the blue litmus turns to red.

Therefore, the salt whose aqueous solution will turn blue litmus to red is Ammonium Sulphate.

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