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A 1 mL sample of a 0.10 M weak monobasic base is diluted to a final volume of 100 mL at constant temperature. If the base dissociation constant, Kb, is 1 × 10⁻⁵, what is the pH of the resulting solution?
- 8
- 9
- 10
- 11
Correct answer: 10
Solution
After 100x dilution C = 1e-3 M; [OH-] = sqrt(1e-5 * 1e-3) = 1e-4, pOH = 4, pH = 10. The stored pH 9 is wrong.
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