Question:
Which of the following can act as both Brønsted acid and Brønsted base?
Which of the following can act as both Brønsted acid and Brønsted base?
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Species that can both donate and accept proton are called amphoteric.
Updated On: Mar 19, 2026
- Na₂CO₃
- OH⁻
- HCO₃⁻
- NH₃
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The Correct Option is C
Solution and Explanation
Step 1: A Brønsted acid donates H⁺, a Brønsted base accepts H⁺.
Step 2: Bicarbonate ion:
HCO₃⁻ rightleftharpoons CO₃²- + H⁺
(acts as acid)
HCO₃⁻ + H⁺ rightleftharpoons H₂CO₃
(acts as base)
Hence, HCO₃⁻ is amphoteric.
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