Consider this equilibrium constant expression: k= (h2s)(oh-)/(hs-) what does this expression represent?

Products over reactants: 

HS- + H2O > H2S + OH- 

The expression represents Kb for HS–

Since OH- is in the expression we're looking for Kb (which is for finding the pOH out).

And since K's are in relation to the reactant (which is in the denominator below ), the solution is Kb for HS-

Ibelieve y y even though i've only taken chemistry for one year