... Crystallising Dish using the scoop. The mass of the crystallising dish with the Hydrated Magnesium sulphate in will now be measured and recorded. The mass of the crucible dish on its own will be subtracted from the mass of the crystallising dish with the Hydrated Magnesium sulphate in, which will give the mass of the Hydrated Magnesium sulphate on its own. The apparatus will then be set up as shown in the diagram, and the Hydrated Magnesium sulphate will be heated for 3 minutes before its mass is measured. This will evaporate all the H2O out of the substance. After this mass has been recorded, the substance will be replaced over the flame of the Bunsen burner. After one minute the mass will be re-measured. This will be repeated every minute until there is no change in the mass. This experiment will then be repeated. Fair Testing To make this ...

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