How Does pH Adjustment Affect Sulfide Concentration in H2S Saturated Solutions?

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Using LeChatelier's principle, how do pH adjustment affect the sulfide concentration in a solution saturated with H2S(aq)? Is the sulfide concentration higher or lower in an acidic solution?

My book doesn't explain much about the lechatelier principle, but my guess would be that the concentration is lower since H2S is acidic? I am just guessing based off the example given by the book though. Any help please?
 
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Write dissociation reaction for H2S and think, in which direction will the equilibrium shift when you change concentration of H+.