Explain which one of the subsequent conditions is always true for a titration of a weak acid with a strong base?
a. A colored indicator with apKa less than 7 should be used.
b. If a colored indicator is used, it must change color rapidly in the weak acid's buffer region.
c. Equal volumes of weak acid and strong base are required to reach the equivalence point.
d. The equivalence point occurs at a pH equal to7.
e. The equivalence point occurs at a pH greater than 7.