KHS can act as a weak acid or a weak base.
HS-(aq) + H2O(l)
S2-(aq) + H3O+(aq) Ka2 = 1.3 x 10-13
HS-(aq) + H2O(l)
H2S(aq) + OH-(aq) Kb2 = 1.0 x 10-7
Which of the following statements is correct?
A) A solution of 0.1 M K2S and 0.1 M KHS will be acidic.
B) A solution of 0.01 M H2S will have a pH = 2.
C) A solution of 0.1 M KHS will be weakly basic.
D) H2S is over 90% ionized in water solution.
E) The S2- ion concentration in a 0.1 M KHS solution does not depend on pH.
Correct Answer:
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