The Acid-Insoluble Sulfides and Base-Insoluble Sulfides Can Be Separated from Each

Multiple Choice

The acid-insoluble sulfides and base-insoluble sulfides can be separated from each other by changing the pH of the aqueous solution that contains them. At low pH, the acid-insoluble sulfides will precipitate out. What role does the acid play in this process?

A) The H⁺ ion is produced by the dissolving sulfide, so the presence of an acid hinders the dissolution process.
B) The sulfide reacts with the H⁺ ion, forming the cation and H₂S.
C) The sulfide reacts with any OH^- ions present, forming S(OH) ₂ and the cation.
D) The sulfide forms a complex ion with the H⁺ provided by the acid.
E) The acid does not play a role in the dissolution process of metal sulfides.