Suggest a test to find the hardness of water and explain the procedure

1.	Suggest a test to find the hardness of water and explain the procedure.
Answer» Hardness of water can be tested with the help of a good quality soap. Procedure : (1) Take 50 ml of water from different sources i.e., tap water, well water, lake water, pond water, river water etc. in different test tubes and lable them as A, B, C, D etc. (2) Add 1 gm of good quality soap to each test tube. (3) Close the each test tube with rubber corks. (4) Shake test tube A for 15 seconds and keep it undisturbed for 30 seconds. Measure the height of the foam formed. Note the height of foam in our notebook. (5) Repeat the process for each test tube and record your observation in your notebook. (6) The water which gives less foam is considered as hard water.

Suggest a test to find the hardness of water and explain the procedure.

Answer»

Hardness of water can be tested with the help of a good quality soap.

Procedure :

(1) Take 50 ml of water from different sources i.e., tap water, well water, lake water, pond water, river water etc. in different test tubes and lable them as A, B, C, D etc.

(2) Add 1 gm of good quality soap to each test tube.

(3) Close the each test tube with rubber corks.

(4) Shake test tube A for 15 seconds and keep it undisturbed for 30 seconds. Measure the height of the foam formed. Note the height of foam in our notebook.

(5) Repeat the process for each test tube and record your observation in your notebook.

(6) The water which gives less foam is considered as hard water.

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