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🔬 Science - Class 8
Unit 10 · Materials Used in Daily Life

Hardness of Water Presentation

ScienceSubject
8 minEstimated read
Slide 1 of 4
Science and Technology, Class 8

Hardness of Water

Soft water and hard water · Temporary and permanent hardness · Ways of removing hardness

What We Will Learn Today

🫧

Telling water apart by its soap lather

💧

The meaning of soft water and hard water

⚗️

Temporary and permanent hardness

🧪

The four ways of removing hardness

Soft Water and Hard Water

🫧Soft water
No calcium or magnesium salts in it
A little soap gives plenty of foam
Rain water and surface water
VS
🪨Hard water
Calcium and magnesium salts are dissolved in it
Soap gives no foam
Water from wells and hand pumps

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Presenter notes: Ask the class whether soap lathers well at home. After hearing their answers, tell them today's lesson explains why it does or does not.