30. The pH of an aqueous solution at 25°C is raised from 2.0 to 5.0. Which statements are true?
(A) The final [OH⁻] is 1 × 10⁻⁹ M.
(B) The [H⁺] decreases by a factor of 30.
(C) The initial solution could be 0.010 M CH₃COOH.
(D) The pOH decreases from 12.0 to 9.0.
(E) The initial [H⁺] is 1 × 10⁻² M.

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