Which acid is the conjugate acid of carbonate ion?

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Multiple Choice

Which acid is the conjugate acid of carbonate ion?

Explanation:
Proton transfer defines conjugate acid–base pairs. The carbonate ion CO3^2– comes from carbonic acid H2CO3 by losing two protons: H2CO3 → H+ + HCO3– → 2H+ + CO3^2–. This means carbonate is the conjugate base of carbonic acid, and conversely carbonic acid is the conjugate acid associated with carbonate in this two-step relationship. The equilibrium shows carbonic acid serves as the acid form that, through deprotonation, leads to carbonate, so carbonic acid is the best answer.

Proton transfer defines conjugate acid–base pairs. The carbonate ion CO3^2– comes from carbonic acid H2CO3 by losing two protons: H2CO3 → H+ + HCO3– → 2H+ + CO3^2–. This means carbonate is the conjugate base of carbonic acid, and conversely carbonic acid is the conjugate acid associated with carbonate in this two-step relationship. The equilibrium shows carbonic acid serves as the acid form that, through deprotonation, leads to carbonate, so carbonic acid is the best answer.

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