1. 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.
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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 causes permanent hardness in water?
- Dissolved Nitrate molecules
- Dissolved Calcium Suphate molecules
- Dissolved Lead molecules
- Dissolved Zinc molecules
4. What is limescale?
- Calcium Nitrate
- Calcium Carbonate
- Calcium Sulphate
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