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27 Water SAQ2

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Questions and Answers

What type of hardness can be removed by boiling water?

Temporary hardness

What is the purpose of adding chlorine to water treatment?

To kill pathogenic bacteria and keep the water bacteria-free until it reaches its destination.

What is the purpose of flouridation in water treatment?

To strengthen teeth and prevent decay.

What is the difference between temporary and permanent hardness?

Temporary hardness can be removed by boiling, while permanent hardness cannot. Signup and view all the answers

How can heavy metals be removed?

Precipitation Signup and view all the answers

What is ion exchange used for in water treatment?

To remove permanent hardness by swapping Ca²⁺ or Mg²⁺ ions with Na⁺ ions. Signup and view all the answers

What is the purpose of pH adjustment in water treatment?

To adjust the pH level of water to prevent corrosion of pipes. Signup and view all the answers

What is the first stage of sewage treatment?

Primary treatment, which involves screening and settling. Signup and view all the answers

What is the process called when small suspended solids in water come together?

Flocculation Signup and view all the answers

Name some compounds responsible for permanent hardness in water?

CaCl₂, MgCl₂, CaSO₄ , MgSO₄ Signup and view all the answers

What happens to calcium hydrogencarbonate when hard water is boiled?

It decomposes Signup and view all the answers