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AP EAMCET202125 Aug 2021Morning ShiftChemistryIonic EquilibriumActual

Which of the following species acts as both bronsted acid and base?

Options

  1. AOH ⁻
  2. BNH ₃
  3. CNaCl
  4. DHSO ₄⁻

Correct answer

D. HSO ₄⁻

Step-by-step solution

A Bronsted-Lowry acid is a proton ( H ⁺ . ion) donor while Bronsted-Lowry base is a proton ( H ⁺ . ion) acceptor. HSO ₄⁻+ H ₂ O H ₂ SO ₄+ OH ⁻ (Bronsted based) HSO ₄⁻+ H ₂ O SO ₄²⁻+ H ₃ O ⁺ (Bronsted acid) HSO ₄⁻ act as a conjugate base of sulphuric acid and does not give H ⁺ . SO ₄²⁻ is a conjugate base of HSO ₄⁻ and does not get ionised further. Thus, HSO ₄⁻ is Bronsted acid as well as Bronsted base.

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