Acids are classified as monoprotic or polyprotic which of the following is a polyprotic acid?
Correct answer: D. H2CO3
- A. CH3CO2H (aq)
- B. HOCl (aq)
- C. HCHO2
- D. H2CO3
Explanation
H2CO3 is a polyprotic acid. It can donate two protons in separate dissociation reactions: H2CO3 ←→ H+ + HCO3- HCO3- ←→ H+ + CO32- These dissociation reactions show that carbonic acid can donate two protons sequentially, making it a polyprotic acid.
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About Bronsted-Lowry and Lewis Concepts
The Brønsted-Lowry concept defines acids as proton donors and bases as proton acceptors, producing conjugate acid-base pairs. The Lewis concept extends the idea to electron-pair acceptors and donors, so compounds such as BF3 and NH3 can be treated as acid and base even without proton transfer, unlike the Arrhenius definition.
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