S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which ion is responsible for the basicity of a solution when ammonia is dissolved in water?

  • (A) NH4+
  • (B) OH-
  • (C) NH2-
  • (D) H+
  • Correct Answer - Option(B)
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  • Filed under category Chemistry
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Explanation by: Shyam Dubey
When ammonia dissolves in water it reacts partially: NH3 + H2O ⇌ NH4+ + OH-. The OH- ion increases the pH, making the solution basic. NH4+ is the conjugate acid and its presence does not make the solution basic (it is slightly acidic). NH2- (amide) is not formed in aqueous ammonia under normal conditions. H+ would make solution acidic, not basic.

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