Separating mixtures
Lemonade is a mixture of different compounds. Carbon dioxide, water and sugar are the major ingredients. Separating the carbon dioxide from the lemonade is easy. Sometimes it just requires a little shaking and the lemonade soon becomes flat. Lemondae is said to be flat when all the carbon dioxide, that gives it the fizz, is gone.
To separate the water and the sugar is going to be a little more difficult. Stephen suggested that filtering the lemonade through fine filter paper will separate the sugar form the water.
Is this possible? Explain .
What happens to soluble substances, like sugar or salt, when they dissolve in water?
Weigh a clean crucible. Using a measuring cylinder, measure 5mls of lemonade and place this volume in a crucible. Weigh the crucible and its contents. Heat the crucible to evaporate the water as shown on the right.
When most of the water has evaporated remove the crucible from the flame and allow it to sit. The mixture is very hot and the water is still evaporating. Smell the contents of the crucible.
Is the smell familiar?
What do you think is the major component of the mixture left behind?

Weigh the crucible when it has cooled down and fill in the table below.

Click for assistance with the calculations
Mass
Mass of crucible
Mass of crucible and 5mls of lemonade
Mass crucible when all the water has evaporated
Mass of sugar and flavourings present
Mass of sugar and flavourings per ml
Percentage of sugar by mass
Try this experiment with other brands of soft drink and determine which one has the most sugar content per ml of drink.
How does diet lemonade differ from normal lemonade?
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