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The question:

"Use balanced equations to determine whether Fe(OH)₂ or CuS has a different solubility with a change in pH.

a. Both Fe(OH)₂ and CuS change solubility with changing pH.
b. CuS changes solubility with changing pH. Fe(OH)₂ does not change solubility.
c. Fe(OH)₂ changes solubility with changing pH. CuS does not change solubility.
d. Neither Fe(OH)₂ nor CuS change solubility with changing pH."

I chose c., and Iapos;m wrong. Why? Since the anion of Fe(OH)₂ is basic, it changes with pH (uh, doesnapos;t it?).

The big problem is, I donapos;t know how to determine how CuS behaves in changing pH. How do I? Please help.
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