Other questions in this quiz

2. Which ions cause hardness in water?

  • Hydrogencarbonate ions in Calcium/Magnesium hydrogencarbonate
  • Carbonate ions in Calcium/Magnesium carbonate
  • Nitrate ions in Calcium/Magnesium Nitrate

3. What kind of hardness will be removed with the use of sodium cabonate (Na2CO3) ?

  • Temporary and Permanent
  • Temporary
  • Permanent

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

  • 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 100cm3 of sample water to a conical flask. Boil the water to 105 degrees celcius. Let it evapourate. Measure the amount of limescale produced.
  • 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. Under a microscope cound the number of ions present and record their number.

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

  • carbon dioxide + water + calcium carbonate > Calcium hydrogencarbonate
  • carbon dioxide + hydrogen gas + calcium carbonate > calcium hydrogencarbonate
  • carbon monoxide + water + calcium carbonate > calcium hydrogencarbonate
  • carbon + water + calcium carbonate > calcium hydrogencarbonate

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