Answer :

To find the hardness of water


Step 1: Take some distilled water in a test tube and hand pump water in another test tube.


Step 2: Add some drops of soap solution to both the tubes.


Step 3: Shake both the tubes together. Observe the foam formed.


The test tube having distilled water shows more foam whereas the test tube having hand pump water forms a white precipitate due to the presence of calcium and magnesium ions. This indicates that it is a hard water.


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