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Lesson 22: Separating Mixtures – Filtration Separating insoluble solids Apparatus and method
Year 8 • Chemistry
Separating Mixtures – Filtration
In this lesson, students learn how filtration is used to separate insoluble solids from liquids, identify the apparatus used, and understand the method step by step with real-life examples.
Lesson Objectives
- Understand what filtration is.
- Identify insoluble solids.
- Name the apparatus used in filtration.
- Describe the filtration method.
1. What Is Filtration?
Filtration is a separation technique used to remove an insoluble solid from a liquid.
An insoluble solid does not dissolve in the liquid.
[ Image Placeholder – Filtration Diagram ]
Examples of insoluble solids:
• Sand in water
• Chalk in water
• Muddy water
• Sand in water
• Chalk in water
• Muddy water
2. Apparatus Used in Filtration
Special equipment is used to carry out filtration safely and effectively.
[ Image Placeholder – Filtration Apparatus ]
Apparatus includes:
• Filter funnel
• Filter paper
• Beaker or conical flask
• Mixture to be filtered
• Filter funnel
• Filter paper
• Beaker or conical flask
• Mixture to be filtered
3. Filtration Method (Step-by-Step)
Follow these steps to carry out filtration correctly.
[ Image Placeholder – Filtration Steps ]
Steps:
1. Fold the filter paper and place it in the funnel
2. Put the funnel into a flask or beaker
3. Pour the mixture into the funnel slowly
4. Liquid passes through as the filtrate
5. Solid remains as the residue
1. Fold the filter paper and place it in the funnel
2. Put the funnel into a flask or beaker
3. Pour the mixture into the funnel slowly
4. Liquid passes through as the filtrate
5. Solid remains as the residue
4. Filtration in Everyday Life
Filtration is used in many real-life situations.
[ Image Placeholder – Filtration in Daily Life ]
Real-life examples:
• Water filters remove dirt
• Coffee filters separate coffee grounds
• Air filters trap dust particles
• Water filters remove dirt
• Coffee filters separate coffee grounds
• Air filters trap dust particles
Practice Questions
A. Fill in the Blanks
- Filtration separates an __________ solid from a liquid.
- The solid left on the filter paper is called the __________.
- The liquid that passes through is called the __________.
- Sand is __________ in water.
- A __________ is used to hold the filter paper.
B. True or False
- Filtration can separate salt from water.
- Filter paper lets liquid pass through.
- The residue is a liquid.
- Filtration is used to clean water.
- Chalk is insoluble in water.
C. Short Answer
- What is filtration?
- Give one example of an insoluble solid.
- Name two pieces of filtration apparatus.
- What is the filtrate?
- Why is filtration useful?
✅ Show Answer Key
A. Fill in the Blanks
- insoluble
- residue
- filtrate
- insoluble
- funnel
B. True or False
- False
- True
- False
- True
- True
C. Short Answer
- A method to separate an insoluble solid from a liquid.
- Sand / chalk / mud.
- Filter paper and funnel.
- The liquid that passes through the filter.
- It removes solids from liquids.
© Aviate Learning – Filtration (Year 8)
🧪 Interactive Filtration Simulator
Simulate filtration by choosing a mixture and filtering it.
Observe the residue and the filtrate.
Choose a mixture and click “Start Filtration”.