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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 sodium hydroxide.

The student begins titrating a 33.4 mL sample of a 0.392 M aqueous solution of acetic acid with a 0.442 M aqueous sodium hydroxide solution, but runs out of standardized base before reaching the equivalence point. The student's last observation is that when 19.4 milliliters of sodium hydroxide have been added, the pH is 4.992.

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

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