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A 0.451-g sample of an unknown monoprotic acid is titrated with 0.150 M NaOH. The resulting titration curve is shown here. Determine the molar mass and pKa of the acid.

A 0.451-g sample of an unknown monoprotic acid is titrated with 0.150 M NaOH. The resulting titration curve is shown here. Determine the molar mass and pK_a of the acid.