Having established that salt dissolves in water, we set about trying to remove salt from rock salt. Using a mortar and pestle, we ground the rock salt into a course powder, added it to 50ml of warm water and stirred vigorously to speed up the dissolving process. We then poured this mixture through a funnel containing a filter paper and collected the water that passed through in a beaker. We have placed this liquid in a warm location and will observe regularly. We are expecting the water to evaporate, thus leaving the salt.