Question

A 25.00-mL sample of propionic acid, HC3H5O2, of unknown concentration A 25.00-mL sample of propionic acid, HC3H5O2, of unknown concentration was titrated with 0.151 M KOH. The equivalence point was reached when was titrated with 0.151 M KOH. The equivalence point was reached when 41.28 mL of base had been added. What is the pH at the equivalence point?    41.28 mL of base had been added. What is the pH at the equivalence point?     Ka   for propionic acid is    1.3×10–5   at 25°C.Ka   for propionic acid is    1.3×10–5   at 25°C.

Select one:

a. 8.93

b. 7.65

c. 9.47

d. 5.98

e. 9.11