Question

which of the following form acidic solution in water ? a) K2SO4. b) (NH4)2.SO4. c) Na2CO3. d) Cu(NO3)2
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Answer 1

Answer:

Answer is b) (NH4)2.SO4

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Answer 2

Answer:

(NH₄)₂SO₄ and Cu(NO₃)₂ form acidic solutions in water.

both options B and D are correct.

Explanation:

Salts of a strong base and strong acid will dissolve in water and pH will remain neutral (at 7). Salt derived from a weak base and strong acid forms an acidic solution in water (pH < 7).salt derived from a strong base and weak acid will dissolve in water to give a basic solution  (pH > 7).

Strong acid          strong base       weak acid        weak base

H₂SO₄                     KOH                      H₂CO₃          NH₃

HNO₃                      NaOH                                         Cu(OH)₂                    

So,

K₂SO₄ is a salt of a strong base and strong acid, thus it will not affect the pH of aqueous solution⇒ neutral

(NH₄)₂SO₄ is formed from a weak base and strong acid. SO₄²⁻ is a conjugate base of strong acid, so it will not affect pH, but NH₄⁺ will affect as it is the conjugate acid of a weak base. So the solution will be acidic.

Na₂CO₃ is salt from a strong base and weak acid, so it gives a basic solution.

Like (NH₄)₂SO₄, Cu(NO₃)₂ is derived from a weak base and strong acid, the solution in water will be acidic.

Hence, both options B and D are correct.