Which compound is INSOLUBLE in water? 1. potassium nitrate 2. calcium carbonate 3. sodium carbonate 4. ammonium chloride
Calcium Carbonate - because Sea Shells :)
Somewhere in a general chemistry book you'll find a horrendous table of ions and solubity - we call these "solubility rules" - blah. Anyway, they say things like "Nitrate compounds are soluble"
"Group1 compounds are soluble", "Ammonium compounds are soluble"....that takes care of 1, 3, and 4. That leaves 2.
Calcium Carbon is insoluble in water...or only slightly soluble, as in it has a Ksp.