You can do one of three things:
(a) You can
cool the salty water. Ice will form and the ice
will not have salt in it. One you pull out the ice
and melt it, you will have pure water. This is
(b) You can evaporate the
water by boiling it. If you collect and cool the
vapor, the water you collect will be pure and all
the salt will be left behind. This is called
(c) You can pump the salty
water thought something called a reverse-osmosis
membrane, which is a kind of special filter. On
the side that you pump, the salt will be left
behind. On the other side of the membrane you will
obtain pure water.
A good way to do this would be to boil the water.
When salty water boils only the pure water will
turn into steam, but the salt will be left
You could do this with a test tube of
sea water. Put a little sea water in the test tube
and seal with a stopper, but use a stopper which
has a hole in it to connect a length of tubing.
You can put the other end of the tubing loosely in
another test tube.
Now boil the water in the
1st test tube using a bunsen burner. The sea water
will boil and turn into steam. Hot steam rises and
will rush into the tubing. As the steam moves
along the tubing it will cool and turn back into
water (condense) This clean condensed water can
then be collected in the second test tube.
all the sea water has boiled away you should
notice that the salt is left behind.
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