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The conjugate base of H₂CO₃ (carbonic acid) is HCO₃⁻ (bicarbonate ion).
Here’s the breakdown:
A conjugate base is formed when a Brønsted-Lowry acid (like H₂CO₃) donates a proton (H⁺).
In this case, H₂CO₃ loses a proton to become HCO₃⁻.
Since H₂CO₃ is neutral (charge 0), and it loses a positively charged proton (H⁺), the conjugate base (HCO₃⁻) gains a negative charge of 1.

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The conjugate base of H₂CO₃ (carbonic acid) is HCO₃⁻ (bicarbonate ion).
Here’s the breakdown:
A conjugate base is formed when a Brønsted-Lowry acid (like H₂CO₃) donates a proton (H⁺).
In this case, H₂CO₃ loses a proton to become HCO₃⁻.
Since H₂CO₃ is neutral (charge 0), and it loses a positively charged proton (H⁺), the conjugate base (HCO₃⁻) gains a negative charge of 1.