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Unformatted text preview: Seawater Temporary hard water Seawater, boiled then cooled (permanent hard water) Temporary hard water, boiled then cooled What to do 1. Collect a conical flask and bung. Check the bung is a good fit. 2. Measure 10 cm 3 of water sample into a conical flask using a measuring cylinder. 3. Using the burette add 1 cm 3 of soap solution to the water. Stopper the flask and shake vigorously. If no lather is produced, add another 1 cm 3 of soap solution. Continue in this way until a permanent lather (one that lasts for 30 seconds) is obtained. Record the volume of soap solution needed to produce a permanent lather. 4. Repeat this procedure for the other water samples. Safety Wear eye protection. Questions 1. Is the rainwater hard or soft? 2. Is seawater hard or soft? 3. Does seawater contain temporary hardness, permanent hardness or both? Home...
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- Winter '08
- soap solution, permanent lather