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1. Solute and
Solvent

2. Learning Objectives
By the end of this lesson, students will be able to:
1. Identify and explain the roles of solute and
solvent in a solution using everyday examples.
2. Give examples of common solutes and
solvents.
3. Describe how solutes and solvents interact to
form a solution.

3. Engage (Warm-Up Activity)
Think-Pair-Share:
“What happens when you stir sugar
into water?”

4. Guide Questions
Does the sugar disappear?
Where does it go?
Can you get the sugar back?
What might affect how fast it dissolves?

5. Scientific Concept to Highlight:
• Dissolving: Sugar dissolves in water, forming a
solution. The sugar molecules spread out evenly
among the water molecules.

6. Scientific Concept to Highlight:
• Physical Change: This is a physical change, not
a chemical one—the sugar is still sugar, just in a
different form.

7. Scientific Concept to Highlight:
• Factors Affecting Dissolution: Temperature,
stirring speed, and amount of sugar can affect
how quickly it dissolves.

8. Solute and Solvent
https://youtu.be/i4lTvRNkRP4

9. Key Concepts:
Solute: The substance that is dissolved.
Solvent: The substance that does the
dissolving.
Solution: A homogeneous mixture of solute
and solvent.

10. Everyday Examples:
Solution Solute Solvent
Saltwater Salt Water
Sweet tea Sugar Tea (mostly water)

12. Simple Experiment: Dissolving
Salt in Water
Materials Needed
- Clear glass or beaker
- Tap water
- Table salt
- Spoon or stirrer
- Optional: food coloring (to make it more
visual)

13. Simple Experiment: Dissolving
Salt in Water
Procedure
1. Fill the glass halfway with water.
2. Add a teaspoon of salt to the water.
3. Observe what happens before stirring.
4. Stir the mixture gently with a spoon.
5. Watch as the salt disappears and the water
becomes clear again.

14. Simple Experiment: Dissolving
Salt in Water
Observation
- Before stirring, salt settles at the bottom.
- After stirring, salt dissolves and disperses evenly in
the water.
- The water looks clear, but now contains dissolved salt
— a solution.

15. Simple Experiment: Dissolving
Salt in Water
Explanation
- Salt = Solute (substance being dissolved)
- Water = Solvent (substance doing the dissolving)
- The salt particles break apart and spread throughout
the water, forming a homogeneous mixture.

16. factors affecting solubility
1. Temperature
2. Stirring
3. Particle size

17. factors affecting solubility
1. Temperature
- Higher temperature increases
solubility for most solid solutes.

18. factors affecting solubility
1. Temperature
- When water is heated, its molecules
move faster, allowing them to break
apart solute particles more easily.

19. factors affecting solubility
1. Temperature
- Example: Sugar dissolves faster in
hot tea than in iced tea.

20. factors affecting solubility
2. Stirring (Agitation)
- Stirring speeds up the dissolving
process but doesn’t change the amount
that can dissolve.

21. factors affecting solubility
2. Stirring (Agitation)
- It helps distribute solute particles
throughout the solvent more quickly.

22. factors affecting solubility
2. Stirring (Agitation)
- Example: Stirring salt into water
helps it dissolve faster than just letting
it sit.

23. factors affecting solubility
3. Particle Size
- Smaller particles dissolve faster
because they have more surface area
exposed to the solvent.

24. factors affecting solubility
3. Particle Size
- Larger chunks take longer to
dissolve.

25. factors affecting solubility
3. Particle Size
- Example: Powdered sugar dissolves
faster than sugar cubes.

26. Summary
Factor Effect on Solubility
Temperature Increases solubility of solids in liquids
Stirring Speeds up the rate of dissolving (not the amount
dissolved)
Particle Size Smaller particles dissolve faster due to greater
surface area

27. Instructions: Identify the Solvent to be
used in the solution
Solute Solvent
1. Salt
2. Sugar
3. Carbon dioxide
4. Ink
5. Acetic acid