Use balanced equations to determine whether either Fe(OH)2 or CuS has a different solubility with a change in pH:
a.) Neither Fe(OH)2 nor CuS change solubility with changing pH.
b.) Fe(OH)2 changes solubility with changing pH. CuS does not change solubility.
c.) CuS changes solubility with changing pH. Fe(OH)2 does not change solubility.
d.) Both Fe(OH)2 and CuS change solubility with changing pH.