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pH of a Mixture

APCHEM-QGUIO4

A weak acid is monoprotic and $K_a = 1.0 × 10^{-4}$.

Which of the following is the pH of a solution that contains 100.0 mL of 0.25 M of the weak acid and 75.0 mL of 0.20 M sodium hydroxide?

A

3.83

B

4.00

C

4.18

D

5.51