Q28 of 37 Page 336

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

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.


More from this chapter

All 37 →
26

What happens when a small piece of sodium is dropped into ethanol?

 27

Two carbon compounds A and B have molecular formula C3H8 and C3H6 respectively. Which one of the two is most likely to show addition? Justify your answer.

 29

Suggest a chemical test to distinguish between ethanol and ethanoic acid and explain the procedure.

 30

An organic compound 'X' with a molecular formula C2H6O undergoes oxidation with alkaline KMnO4 and forms the compound Y', that has molecular formula C2H4O2

a. Identify 'X' and 'Y'


b. Write your observation regarding the product when the compound 'X' is made to react with compound 'Y' which is used as a preservative for pickles.