b Solubility of a substance in water at a given temperature Put about 50 cm3 of water in a beaker and add baking powder sodium bicarbonate gradually while stirring Potassium sulphate is an alternative substance Make a saturated solution by stirring until no more solute will dissolve Read the temperature of the saturated solution Weigh a clean evaporating dish w1 Add some clear saturated solution and weigh again w2 Carefully evaporate the solution in the evaporating dish to dryness and weigh again w3 The mass of the sodium bicarbonate dissolved  w3  w1 The mass of water  w2  w1  w3 Calculate the solubility of the sodium bicarbonate as g per 100 g water at room temperature