Ionic compounds to test. Sodium chloride, calcium chloride, lithium chloride, potassium chloride, copper ... Add sodium sulfate solution to the test tube until the tube is \(\frac{1}{3}\) full.

Sodium chloride, calcium chloride, lithium chloride, potassium chloride, copper(II) sulfate (1 g of each salt) Concentrated hydrochloric acid Safety : Follow the safety advice given by a teacher.