Fill in the Blanks The purification of rock saltOnline version The purification of rock salt by David Fernández 1 crushed basin dug burner mortar evaporation gauze through pestle stir filter deposited funnel beaker seas blotting edges quantities pure commonest Wash FoId grind Assemble dissolve Bunsen filtration dirty The purification of rock salt One of the chemicals is salt ( in chemical language , sodium chloride ) . This occurs in vast in sea water . It has also been on land as a result of the of the water from which existed millions of years ago . Rock salt is the name given to brown salt crystals which are obviously impure . It is out of salt mines like those in Cheshire . It can be purified in a simple experiment . Experiment Purification of rock salt 1 . the apparatus for the experiment . 2 . Take a small amount of rock salt and up the crystals using a and . 3 . Place a of water on a on a tripod and use a Bunsen to heat the water until it is warm . Pour the crystals into the water and them until they . The solid brown dirt will not dissolve . 4 . a piece of filter paper and put it in a filter , then mixture through the filter . The brown dirt will remain on the paper , while the salt water will pass it into the basin . This process is called 5 . Heat the of salt water until crystals begin to form at the . Then continue the evaporation slowly using a small flame . Cubic crystals of salt will form . Before the evaporation is complete , the contents of the basin . 6 . the salt crystals with a little cold water and dry them with coarse filter paper or paper . They are now salt .
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