QUESTION 2 A monoprotic weak acid. HA, Is titrated with strong base, Ba(OH)2 in
ID: 1034037 • Letter: Q
Question
QUESTION 2 A monoprotic weak acid. HA, Is titrated with strong base, Ba(OH)2 in aqueous solution. If so.00 mL of 0.1000 M HA is titrated with 0.1000 M Ba(OH)2 what is the pH of the titration solution at the equivalence point? Ka-2.5 x 10-5 for HA. Don't forget to take into account the added volume from the , note that the strong base has 2 OH in its addition of base titrant when determining the concentration of weak base, A, at the equivalence point. Also chemical formula. O 8.71 O 10.17 9.71 O 10.64 9.16Explanation / Answer
Ba(OH)2 + 2 HA ---------------------> BaA2 + 2H2O
M1 V1 / n2 = M2 V2 / n2
0.1 x V1 / 1 = 0.1 x 50 / 2
V1 = 25 mL
volume of Ba(OH)2 = 25 mL
at equivalence point only salt left .
salt concentration = 50 x 0.1 / 25+50 = 0.067 M
pH = 7 + 1/2 [pKa + logC ]
pH = 7 + 1/2 [4.60 + log 0.067]
pH = 8.71
answer : 8.71