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6. The bigger the concentration of these compunds, the harder the water.
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.
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.
15. How often does the Ion-Exchange column have to be recharged?