6. How would you carry out an experiment to compare hardness of water samples?
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.
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.
7. What gives water it's characteristic taste?
The vapours in the clouds
The ions dissolved in it
The flavourings added
The bottle it's packaged in
8. What kind of hardness will be removed with the use of sodium cabonate (Na2CO3) ?