(a) (NH4)2S → all ammonium ions are soluble → water soluble
(b) CaCO3 → insoluble carbonate → water insoluble
You may want to reference (Pages 126 - 130)Section 4.2 while completing this problem.
Which of the following compounds is insoluble in water?
(a) (NH4)2S
(b) CaCO3
(c) NaOH
(d) Ag2SO4
(e) Pb(CH3COO)2
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