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MCQ

Question

A weak base BOH ( Kb = 4.0 × 10⁻⁵ ) has a 0.05 M solution with 2% ionization. What is the pH?

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3.0 11.0 Correct 10.5 12.0

α = 0.02 , [OH-] = 0.05 × 0.02 = 1.0 × 10⁻³ , pOH = 3 , pH = 14 - 3 = 11 .

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