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6. The bigger the concentration of these compunds, the harder the water.

  • True
  • False

7. Advantages of using hard water are...?

  • Hard water does not corrode lead pipes
  • Hard water tastes better
  • All of the above
  • The dissolved compounds are good for you

8. Disadvantages of using hard water are...?

  • All of the above
  • Soap runs out quicker
  • Scale forms in heating appliances

9. What type of industries are set up in SOFT water reigons?

  • Metal
  • Wool
  • Breweries
  • Stationary

10. Why is distillation not used for removing hardness on a large scale?

  • It costs too much
  • It takes too much time
  • It is not efficent

11. The cheapest way to remove hardness is by...?

  • Adding a Sodium Carbonate solution
  • Distillation
  • Using an In-Exchange Column

12. What is the equation for the process of adding Sodium Carbonate to hard water?

  • Sodium Carbonate + Magnesium + Calcium = Calicum Carbonate + Soduim Sulphate
  • Calcium Sulphate +Sodium Carbonate = Sodium Sulphate + Calcium Carbonate
  • Sodium Carbonate + H2O = Sodium Hydroxide + CO2

13. In an Ion-Exchange column there are excess of Hydrogen ions.

  • True
  • False

14. In an Ion-Exchange column, the water is passed through the column and the Calcium and Magnesium are replaced by Hydrogen or Sodium ions.

  • True
  • False

15. How often does the Ion-Exchange column have to be recharged?

  • All the time
  • Often
  • Never