To identify bleaching powder among given samples of chemicals
Given four samples: bleaching powder; sodium chloride; calcium carbonate; and ammonium chloride
dil. sulphuric acid
Put the arnd 1g of salts in different test tubes (marked A, B, C & D) and add 10mL water
Take about 10 mL of dilute sulphuric acid in each of remaining four test tubes. Label them as E, F, G, and H
Dip a small piece of coloured cloth or flower petal in test tube A
Take out the cloth or flower petal from the test tube A and dip it in dil. sulphuric acid in test tube E and stir it gently with the help of a glass rod.
Repeat the process for Test Tube B, C and D
No change in color observed in 3 petal when inserted in test tubes. However, for one of the test tubes, petal is decolorized
Sample which decolorizes the flower petal contains bleaching powder
Bleaching powder is a pale yellowish powder existing with a strong smell of chlorine.
It is soluble in water but due to the presence of impurities, we never observe a clear solution.
Its chemical formula is CaOCl2 with its chemical name as Calcium hypochlorite.