YEAR 7 – SCIENCE OF MIXTURES
Aim: To use distillation to
separate salt from water..
Teachers can use coke
instead of salt water.
• When a solution of solid in liquid is heated, the
liquid will evaporates. The hot vapor that
formed can be condensed back into liquid
again on a surface. This method is called
distillation. Distillation is used for separating a
solvent from a solution. The liquid collected is
called a distillate.
• Evaporation + Condensation = Distillation
• Fractional Distillation is a special type of
distillation used to separate a mixture of
liquids. Different liquids boil at different
temperatures. When heated, they boil off and
condense at different times. The apparatus
features a fractionating column, which ensures
that only the liquid that boils at its boiling
point will pass into the condenser.
Round bottom flask
Bosshead and clamp
Do not touch hot
equipment with bare hands.
Wait till the equipment
cools down before you
Use tongs to handle hot
1. Set up the equipment as
shown in the figure.
2. Pour a small amount of
salt water into the
3. Gently boil the mixture
until most of the water
4. The distillate collected
in the conical flask.