When a reaction produces an insoluble salt we will notice cloudiness and solids accumulating at bottom of the test tube.
We refer to a substance as a precipitate if it creates an insoluble salt as a result of soluble compounds reacting in water (see image).Most carbonates other than sodium and potassium, most hydroxides other than sodium and potassium, lead sulfate, barium sulfate, silver chloride, silver bromide, lead iodide, and lead chloride, lead bromide, lead iodide, are insoluble in water.AgCl, PbBr2, and Hg2Cl2 are hence insoluble. The majority of silver salts are soluble. Common silver salts that are soluble are AgNO3 and Ag(C2H3O2); practically all others are insoluble. Salts of sulfate are often soluble.
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