Precipitate & pH Chemistry Q.?

At what pH will FeS begin to precipitate if the Fe^(2+) ion concentration is 0.1M and the H2S concentration is 0.01M? Show calculations to support answer. I don't know how to go about this problem. I've look in my book many times and I just don't know where to start. Can someone give me that push in... show more At what pH will FeS begin to precipitate if the Fe^(2+) ion concentration is 0.1M and the H2S concentration is 0.01M? Show calculations to support answer.

I don't know how to go about this problem. I've look in my book many times and I just don't know where to start. Can someone give me that push in the right direction?
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