A125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 ml of distilled water and titrated with a 0.050 m solution of naoh. the ph of the solution was monitored throughout the titration, and the data were collected. determine the ka of the acid and identify the unknown acid. data- volume of oh- added (ml), ph: 0, 3.09 5, 3.65 10, 4.10 15, 4.50 17, 4.55 18, 4.71 19, 4.94 20, 5.11 21, 5.37 22, 5.93 22.2, 6.24 22.6, 9.91 22.8, 10.2 23, 10.4