Question

a test to determine hardness of water

Answer 1

If soap forms lather in contact with water, then the water is soft water or else hard water

Answer 2

A test to determine the hardness of water:

• A required things to test the harness of water is Soap,three test tubes,tap water,ground water and distilled water.

• Take test tube 1 and add tap water and 10-12 drops of the soap solution in it.
• Repeat the above steps with other ground and distilled water.

• Now shake all the test tubes one by one.

• You will find that the test tube having  the distilled water and tap water will form a Lather.

• Whereas the test tube containing ground water does no form Lather.

• So,we can conclude that those substances which form Lather with he soap solutions are hard.

• Lather is an insoluble compound.

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