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What is the pH of a solution prepared by mixing 30.00 mL of 0.10 MC H 3 C O 2 H with 30.00 mL of 0.040 MC H 3 C O 2 K ? Assume that the volume of the solutions are additive and that K a =1.8Ã 10 ?5 for C H 3 C O 2 H .