Question

Take samples of water from different sources (like a tube well, a lake, a pond, or a river) and pour equal quantities of each sample of water into different test tubes. Measure the height of water in each test tube with a scale. Add one or two drops of liquid soap to each test tube. Shake each test tube five times and observe the height of the lather in each sample. Record your observations in the table. Which water is soft? Which water is hard? Can you say why?

Answer 1

Samples of water (Source):

1. Tap water
2. Well water
3. Pond water
4. River water

Height of lather:

1. Less
2. Less
3. More
4. More