# Chapter 4 - Reactions in Aqueous Solution - Exercises: 4.24c

The precipitate is CdS. Na$_{2}$S (qa) + CdSO$_{4}$(aq) -> CdS(s) + Na$_{2}$SO$_{4}$ (aq)

#### Work Step by Step

Ionic compounds containing sulfide ions are insoluble unless they contain an alkali metal, or a barium, strontium, or calcium ion. Because sulfide reacts with cadmium here, it will form a solid precipitate.

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