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.
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