We’re being asked to determine whether or not CuS is more soluble in an acidic solution or in water.
Solubility is defined as the maximum amount of solute that will dissolve in a solvent at equilibrium.
Recall that the solubility of a salt in an acidic medium depends on the anion present in the compound:
Determine whether or not CuS will be more soluble in acidic solution than in pure water.
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