18. The ionization constants for the diprotic acid H2S are 1.0×10-7and 1.3×10-13. For 0.1molarsolutions of sodium sulfide and sodium hydrogen sulfide, which of the following is true?
(A) The solutions are neutral.
(B)The sodium sulfide solution is the most basic.
(C)Both the solutions are acidic.
(D)The sodium hydrogen sulfide solutions is the most basic.
(E)Both solutions have the same pH.