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A student is asked to determine the value of Ka for acetic acid by titration with...

A student is asked to determine the value of Ka for acetic acid by titration with barium hydroxide.

The student begins titrating a 42.0 mL sample of a 0.594 M aqueous solution of acetic acid with a 0.253 M aqueous barium hydroxide solution, but runs out of standardized base before reaching the equivalence point. The student's last observation is that when 31.7 milliliters of barium hydroxidehave been added, the pH is 4.969.

What is Ka for acetic acid based on the student's data?

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