To test the properties of the sulfate ion, you will examine the reactions of Epsom salts. This salt, MgSO 4 . O, is used as a purgative and, as an aqueous solution, to soak tired feet.
Chlorine is a toxic, pale, yellow-green gas with an irritating odor and low solubility in water.
A convenient laboratory source of chlorine is commercial bleach, which is usually a 5 percent aqueous solution of sodium hypochlorite, NaOCl. The solution behaves as if it contains dissolved chlorine. The products of this reaction are iodine and chloride ion. A second test for iodide ion is formation of a silver iodide precipitate. Yet another test for iodide is the reaction of an iodide salt with sulfuric acid to form a brown solid and cause gas evolution.