Activity 1.10

Activity . Take about mL of sodium sulphate solution in a test tube. In another test tube, take about mL of barium chloride solution. Mix the two solutions (Fig. . ). What do you observe? Figure . Figure . Figure . Figure . Figure . Formation of barium sulphate and sodium chloride You will observe that a white substance, which is insoluble in water, is formed. This insoluble substance formed is known as a precipitate. Any reaction that produces a precipitate can be called a precipitation reaction. Na SO (aq) + BaCl (aq) → BaSO (s) + 2NaCl(aq) ( . ) (Sodium (Barium (Barium (Sodium sulphate) chloride) sulphate) chloride) Figure . Figure . Figure . Figure . Figure . (b) Iron nails and copper sulphate solutions compared before and after the experiment