Calculate the [H₃O⁺] and pH of 0.315 M H₂SO₃.

• A. [H₃O⁺] = 0.0514 M; pH = 1.30
• B. [H₃O⁺] = 0.0932 M; pH = 1.03
• C. [H₃O⁺] = 0.0334 M; pH = 1.48
• D. [H₃O⁺] = 0.0634 M; pH = 1.20

Answer: (D)