Question

Consider this equilibrium constant expression:

What does this expression represent?
A. Kb for H2S
B. Ka for H2S
C. Kb for S2–
D. Kb for HS–
E. Ka for HS–

Answer 1

D is the right one

and thats all folks hope this help

Answer 2

The answer would be: D. Kb for HS–

Kb is the dissociation constant of an acid/base molecule. The word b in Kb is base, which means the formula should have an OH- ion inside it. Ka would be the opposite of Kb where the formula has H+ ion.
In this question, the formula is: [H2S][OH-]/ [HS-]
Since there are OH- ion. Since H2S is acid and HS- is base, I think it should be Kb for HS–