Which acid has formula H2CO3?

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Multiple Choice

Which acid has formula H2CO3?

Explanation:
Recognizing acids by their formulas. H2CO3 corresponds to carbonic acid, which forms when carbon dioxide dissolves in water: CO2 + H2O ⇌ H2CO3. It’s a weak, diprotic acid that can donate two protons in steps. The other acids listed have different formulas: phosphoric acid is H3PO4, nitric acid is HNO3, and acetic acid is CH3COOH. So the formula H2CO3 specifically identifies carbonic acid.

Recognizing acids by their formulas. H2CO3 corresponds to carbonic acid, which forms when carbon dioxide dissolves in water: CO2 + H2O ⇌ H2CO3. It’s a weak, diprotic acid that can donate two protons in steps. The other acids listed have different formulas: phosphoric acid is H3PO4, nitric acid is HNO3, and acetic acid is CH3COOH. So the formula H2CO3 specifically identifies carbonic acid.

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