1 crush some rock salt using the mortar and pestle. 2 put the crushed rock salt into a beaker and add some water. stir the mixture. 3 carefully filter the mixture. the liquid that comes through the filter paper should be clear. 4 put a little liquid in an evaporating basin and heat it. wear eye protection. 5 the powder that is left in the evaporating basin should be pure salt. 1 describe how you obtained pure salt from rock salt.
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