Question

3. Calculate the pH (Ka = 2.0 x 10-2 alculate the pH at the beginning of a titration of 50.00 of 0. 20 x 10-2) with NaOH solution. If the quadratic equa e accurate, what would the percent error in the pH if the simple equation were used to calculate the phine of 50.00 of 0.005M HA quadratic equation is assumed to the simpler (square root) 4. According to Figure 19.1 at which point(s) ABCD on the titration curve does a buffer solution result?

Answer 1

PH need to be caluulated at tha baginn t tutralin CH J = Cole 0.005 x (0.e284) 50 ML of 0 005M HA C Ka = 2xlo2 At t baginung, we no Naor fas bean addad tH=2.3828 True PH Value HA H A న్ )) talewatey pH Larsidering aua ht eualo ie, afprazuatton Metod t; Ca C-Cd Cd C: Conc eHA O00SM (1 we asune Ka = Co dunoialten ka= (Co)Cca) 1 ka= ca 1-d 0.02 Puttirg Valuw O.005 రాంక 2NO2 1- d = 0.02 -togt] = -log0.005x 2) thus pH = O.02-0.020 14 O.005 +o02d-0.02 = 0 PH' 2 saviy quadret eutio ersor 2a 1error= hctualpH-ebsand ptt xloo Actual pH dI002 (o.02-4l0.0s-002) 2(o, O05 2.3828-2 2.3828 da -0.02 t 0.0283 Negletrg 2(0.005 ehor l6, 06 161. /.esros =161-1 dissociadion (duannet be d O8284 Thu, we got an erhes e 1b . bTakig afpori matio Aoute