A compound was found to be soluble in water. It was also found that addition of acid to an aqueous solution of this compound resulted in the formation of carbon dioxide. Which one of the following cations would form a precipitate when added to an aqueous solution of this compound? A)NH₄⁺ B)K+ C)Cr³⁺ D)Rb⁺ E)Na⁺

Question

Quizplus · Accepted Answer

The formation of carbon dioxide upon addition of acid suggests that the compound is a carbonate. The only cation that forms an insoluble carbonate is Cr3+, therefore, it would form a precipitate when added to an aqueous solution of this compound.

A Compound Was Found to Be Soluble in Water