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What is the conjugate base of hydrogen sulfate, HSO₄⁻, after it donates one proton?

A) SO₄²⁻

B) HSO₃⁻

C) SO₃²⁻

D) H₂SO₄

Answer: A

Explanation: Removing H⁺ from HSO₄⁻ leaves the sulfate ion, SO₄²⁻. The negative charge increases by one unit after proton donation.

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