Currently Empty: $0.00
Lesson 25: Solubility and Temperature Effect of temperature on solubility Saturated solutions Different solvents
Year 8 • Chemistry
Solubility and Temperature
In this lesson, students explore how temperature affects solubility, learn what saturated solutions are, and understand why different solvents dissolve different substances.
Lesson Objectives
- Define solubility.
- Explain how temperature affects solubility.
- Understand saturated solutions.
- Compare different solvents.
1. What Is Solubility?
Solubility describes how much of a solute can dissolve in a solvent.
Some substances dissolve easily, while others dissolve only a little or not at all.
[ Image Placeholder – Solute and Solvent ]
Example:
• Sugar is soluble in water
• Sand is insoluble in water
• Sugar is soluble in water
• Sand is insoluble in water
2. Effect of Temperature on Solubility
Temperature affects how fast particles move.
When temperature increases, particles have more energy.
[ Image Placeholder – Hot vs Cold Water Dissolving ]
Key ideas:
• Most solids dissolve better in hot water
• Higher temperature → faster dissolving
• Most solids dissolve better in hot water
• Higher temperature → faster dissolving
This is why sugar dissolves faster in hot tea than in cold water.
3. Saturated Solutions
A saturated solution is formed when no more solute can dissolve at a given temperature.
[ Image Placeholder – Saturated Solution ]
Signs of a saturated solution:
• Solute remains at the bottom
• Stirring does not dissolve it
• Solute remains at the bottom
• Stirring does not dissolve it
4. Different Solvents
Not all substances dissolve in the same solvent.
Different solvents dissolve different solutes.
[ Image Placeholder – Different Solvents ]
Examples:
• Salt dissolves in water but not in oil
• Wax dissolves in oil but not in water
• Salt dissolves in water but not in oil
• Wax dissolves in oil but not in water
Practice Questions
A. Fill in the Blanks
- Solubility describes how much __________ can dissolve.
- Hot water usually dissolves solids __________.
- A saturated solution cannot dissolve any __________ solute.
- Sugar dissolves faster in __________ water.
- Different solvents dissolve different __________.
B. True or False
- Temperature affects solubility.
- Sand is soluble in water.
- A saturated solution has undissolved solute.
- All solutes dissolve in water.
- Solubility depends on the solvent.
C. Short Answer
- What is solubility?
- Why does heating increase dissolving?
- What is a saturated solution?
- Give one example of a solute and solvent.
- Why doesn’t oil dissolve salt?
✅ Show Answer Key
A. Fill in the Blanks
- solute
- better / faster
- more
- hot
- solutes
B. True or False
- True
- False
- True
- False
- True
C. Short Answer
- How much solute dissolves in a solvent.
- Particles move faster.
- A solution that cannot dissolve more solute.
- Salt in water.
- Because salt is not soluble in oil.
© Aviate Learning – Solubility and Temperature (Year 8)