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Water: Hard Water and Soft Water | Class 8 Science

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Water: Hard Water and Soft Water

Last Updated: 1st March 2020

Difference between Hard and Soft Water

- Hard water contains high amounts of calcium and magnesium salts.
- Soft water contains little or no salts of magnesium and calcium.
- Hard water does not lather easily with soap as it forms scum. Scum is a layer of dirt on the surface of a liquid.]
- Soft water lathers easily with soap forming foam.

Fun Facts about Water
- Water covers about 71% of the earth's surface.
- Also, an adult human body contains about 60% water and about 75% in infants.

Disadvantages of Hard Water

- It wastes soap as a lot is used when washing.
- The scum produced stains clothes and plastics
- It reacts with water pipes forming fur that may block water pipes
- In hot water pipes, kettles and showers, hard water forms scale leading to the blockage of pipes

Softening Hard Water

To soften hard water:
  1. Temporarily - Boil the water
  2. Permanently - Use chemicals such as magadi soda

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Guest User
they were fine, exactly what we are taught in school

Guest User
Water is covers 75
Esoma-Ke Replied

Thank you for your comment. Whereas different people indicate different percentages, recent geographical publications have indicated the number as 71%.

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Guest User
Excellent it's just what I wanted

Esoma-KE Member
Very helpful

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