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Calculate the pH of a solution formed by mixing 150.0 mL of 0.10 M HC7H5O2 with 100.0 mL of 0.30 M NaC7H5O2. The Ka for HC7H5O2 is 6.5 × 10^-5. A) 4.31 B) 4.19 C) 3.49 D) 10.51 E) 9.69