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Experiment 19: Identify bleaching powder

Experiment 19: Identify bleaching powder

Objective

To identify bleaching powder among given samples of chemicals

Materials required:

  • Given four samples: bleaching powder; sodium chloride; calcium carbonate; and ammonium chloride
  • dil. sulphuric acid
  • flowers petals
  • test tubes

Procedure:

  • 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

Findings:

  • No change in color observed in 3 petal when inserted in test tubes. However, for one of the test tubes, petal is decolorized

Conclusions:

  • Sample which decolorizes the flower petal contains bleaching powder

Theory:

  • 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.

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