Which is the conjugate acid of CO3-2?

Question

1. HCO₃^-1
2. O₃^-2
3. H⁺¹
4. CO₂
5. CO₃^-2

Answer 1

To find the conjugate acid, just add H⁺.

So adding H to CO₃^2- gives you HCO₃^-. Answer is (1).