Why is CuS less soluble than FeS?

bio1995
Mon, 04 Apr 2011 19:25:50 +0000

I would have expected copper sulfide to be more soluble than iron (II) sulfide due to less electron-electron repulsions and a greater (only very slightly however) bond length. Does anyone know why CuS has such a very small Ksp value compared to FeS? Thanks for the help! This is for AP Chem.

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