Which of the following is true (to a good approximation) for a 0.10 M solution of a weak acid, HA, with a Ka of 10-4 ?
A) [H+] = [A-]
B) [A-] = [OH-]
C) [HA] = [OH-]
D) [H+] = [OH-]
E) pH> 7
F) pH<7