Testing the purity of water

Testing the purity of water

Milk can be used to test the purity of water. Image credit wordpress.com

Milk can be used to test the purity of water. Image credit wordpress.com

ZIMSEC O Level Combined Science Notes: Testing the purity of water

Materials: 4 test tubes, sterilised fresh milk, tap water, borehole water, spring water. plugs

Method

  1. Collect water samples from a borehole, spring and tap
  2. Pour out 5 cm3 of milk into each test tube and label each test tube with letters A-D
  3. Add 5 drops of  tap water to test tube B, borehole water to C and Spring water to test tube D
  4. Cover the test tubes with plugs washed in disinfectant and wiped dry
  5. Leave the dishes in a warm place for a few days

Results and Observations

  • The milk in test tube A was still fresh after a few days
  • The milk in test tube B was slightly sour
  • The milk in C was less fresh when compared to B
  • The milk in D was the most sour

Conclusion

  • Tap water is the safest, followed by borehole water and dam/spring/river water is the least safe to drink

To access more topics go to the Combined Science Notes page.

By |2017-01-17T11:11:12+00:00September 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|Comments Off on Testing the purity of water

About the Author:

He holds an Honours in Accountancy degree from the University of Zimbabwe. He is passionate about technology and its practical application in today's world.
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