In the Titration of a Weak Acid HA with 0

Multiple Choice

In the titration of a weak acid HA with 0.100 M NaOH, the stoichiometric point is known to occur at a pH value of approximately 11. Which of the following indicators would be best to use to mark the endpoint of this titration?

A) an indicator with K_a = 10^-11
B) an indicator with K_a = 10^-14
C) an indicator with K_a = 10^-10
D) an indicator with K_a = 10^-8
E) an indicator with K_a = 10^-12