1. Measure out 25cm3 of water using a pipette
2. Add water to a conical flask
3. Add a little soap solution from a burette, shaking the flask.
4. Add more soap solution, a little at a time, until a lather lasting at least 30 seconds is obtained.
5. Record the volume of the soap solution used.
6. Repeat the procedure of each water sample: distilled, tap water, bottled water and boiled tap water.
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