7a Solubility in water Test different salts taken to show that each has a different solubility in water Take 5 g samples and try to dissolve each in 15 mL of water in a testtube Attach the stopper then shake each testtube vigorously for the same time to show that solubility is a characteristic of a particular substance eg sugar common salt potassium nitrate calcium sulphate The solubility of a salt is usually expressed as the number of grams able to dissolve in 100 g water at 20oC eg ammonium chloride 372 g barium chloride 357 g calcium chloride 427 g copper sulphate 207 g lead nitrate 544 g magnesium sulphate 252 g potassium chloride 340 g potassium iodide 1440 g sodium bicarbonate 96 g sodium chloride 360 g sodium hydroxide 1090 g sodium nitrate 875 g