Distillation experiment for yr 7 using salt water.

1. DISTILLATION
YEAR 7 – SCIENCE OF MIXTURES
G.Ajetrao

2. AIM
Aim: To use distillation to
separate salt from water..
Teachers can use coke
instead of salt water.
(Demonstration practical
ONLY)

3. BACKGROUND INFORMATION
• 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

4. BACKGROUND INFORMATION
• 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.

5. EQUIPMENT
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Bunsen burner
Gauze mat
Conical flask
Round bottom flask
Retort stand
Bosshead and clamp
Tripod
Condenser
Salt water
Water
Safety goggles

6. RISK ASSESSMENT
Risk
Hot equipment
Injury
Burns
Prevention
Do not touch hot
equipment with bare hands.
Wait till the equipment
cools down before you
touch it.
Use tongs to handle hot
equipment.

7. METHOD
1. Set up the equipment as
shown in the figure.
2. Pour a small amount of
salt water into the
boiling flask.
3. Gently boil the mixture
until most of the water
has evaporated.
4. The distillate collected
in the conical flask.

8. RESULTS

9. CONCLUSION
• The distillate in the conical flask is pure water.