Hardness of water Quiz - Chemistry Module 6.

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  • Created by: SashaAS
  • Created on: 12-06-13 12:53

1. Which is the correct word equation for the creation of calcium hydrogencarbonate?

  • carbon dioxide + hydrogen gas + calcium carbonate > calcium hydrogencarbonate
  • carbon dioxide + water + calcium carbonate > Calcium hydrogencarbonate
  • carbon + water + calcium carbonate > calcium hydrogencarbonate
  • carbon monoxide + water + calcium carbonate > calcium hydrogencarbonate
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Other questions in this quiz

2. What gives water it's characteristic taste?

  • The ions dissolved in it
  • The bottle it's packaged in
  • The flavourings added
  • The vapours in the clouds

3. How would you carry out an experiment to compare hardness of water samples?

  • Add 100cm3 of sample water to a conical flask. Under a microscope cound the number of ions present and record their number.
  • Add 100 cm3 of sample water to a conical flask. Add 1cm3 soap solution to the water, put a bung in and shake. Repeat until a good lasting leather is formed ( bubbles cover the surface for atleast 30 seconds). Record how much soap was used.
  • Add 100 cm3 of sample water to a conical flask. Taste it and record the flavour.
  • Add 100cm3 of sample water to a conical flask. Boil the water to 105 degrees celcius. Let it evapourate. Measure the amount of limescale produced.

4. What kind of hardness will be removed by boiling of the water?

  • Temporary Hardness
  • Permanent Hardness

5. What causes permanent hardness in water?

  • Dissolved Nitrate molecules
  • Dissolved Calcium Suphate molecules
  • Dissolved Lead molecules
  • Dissolved Zinc molecules

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