Research question: How do you think we can separate the sugar from water?
On completion of this experiment, learners must be able to:
· Be able to identify what a solute is
· Explain how to separate a solute from a mixture.
· Demonstrate how to separate a solute from a mixture by doing a practical experiment in groups.
Problem:
Mikayla knows that saltwater mixture can be separated by putting the jar that contains the substances in the sun. The water will evaporate and the solute which is the salt will be left behind. She then wonders how she separates sugar water mixture.
Research question:
Hypothesis:
How do you think we can separate the sugar from water?
Materials:
· Water
· Sugar
· Pot
· Gas burner/stove
· Oven gloves
Safety precautions
Be careful around steam to prevent any burn injuries. Wear oven mitts when handling hot cookware. Do not do practical at home without adult supervision. Do not boil the pot dry to avoid permanent damage to it.
Method:
1. Gather into groups and divide roles to individual learners.
2. Mix two teaspoons of sugar into 250ml of water and stir until no sugar particles can be seen.
3. Pour the sugar water solution in a pot.
4. Put the pot onto the stove or gas burner and let it heat up, be careful when using the pot to not burn yourself.
5. Let the water sugar water heat up until it boils for a minute.
6. After the solution boils remember to put off the stove/gas burner.
Results:
State true or false for each of the following sentences:
a) Sugar will dissolve in water _________________
b) Sugar dissolves quicker in hot water than cold water.________________
c) Stirring makes insoluble solids dissolve quicker._____________________
d) Sugar and water mixed together is not a solution.___________________
In the table below mark with an ‘x’ which column you choose is correct. What did you observe happened when we mixed the sugar and water together?
Analysis:
What will happen when the sugar water solution boils?
What will happen when the water evaporates?
What will be left at the bottom of the pot after the sugar and water solution has boiled?
Conclusion:
What do you think is reason for just the sugar being left in the pot after the practical?
State whether your hypothesis was accepted or rejected?
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