This experiment involves the determination of the number of water molecules of crystallization in hydrated barium chloride using titration and precipitation techniques with silver nitrate and potassium chromate. The procedure involves the reaction of chloride ions with silver ions to form a red precipitate of silver chromate, which indicates the end-point of the reaction. Barium ions also react with chromate ions, and to remove them, sulphate ions are added. The mass of anhydrous barium chloride and water present in the sample is calculated, and the ratio of BaCl2 to H2O is determined to find the value of x in the formula BaCl2•xH20. This experiment provides a great opportunity to understand the principles of titration and precipitation methods used to calculate the water of crystallization in compounds.