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What are the causes for Permanent har...

What are the causes for
Permanent hardness

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ICSE-WATER-EXERCISE 3(C)
  1. What is the importance of dissolved impurities in water?

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  2. State two ways, by which a saturated solution can be changed to unsatu...

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  3. What do you understand by Soft water

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  4. What do you understand by Hard water

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  5. What do you understand by Temporary Hard water

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  6. What do you understand by Permanent hard water.

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  7. What are the causes for Temporary hardness

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  8. What are the causes for Permanent hardness

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  9. What are the advantages of (i) soft water (ii) hard water?

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  10. What are stalagmites and stalactites? How are they formed ?

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  11. Name the substances which give water (i) temporary hardness (ii) perma...

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  12. Give equations to show what happens when temporary hard water is boi...

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  13. Give equations to show what happens when temporary hard water is tre...

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  14. State the disadvantages of using hard water.

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  15. What is a soap, what for is it used ?

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  16. What is the advantage of a detergent over soap ?

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  17. Why does the hardness of water render it unfit for use in a (i) boiler...

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  18. Explain with equation, what is noticed when permanent hard water is tr...

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  19. What happens when hard water is treated with washing soda?

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  20. What is permutit method, how can it be used for softening hard water?

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