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Questions 2.5.2(b)

  1. Write a balanced chemical equation for the reaction between chlorine and water.
  2. Write a balanced chemical equation for the decomposition of chloric (I) acid.
  3. Complete the following equation for the bleaching action of chloric (I) acid. HOCl(aq) + Dye Dye+O + ---------

  4. What would you expect to observe during the time chlorine water (a mixture of HOCl and HCl) is exposed to sunlight?
  5. State and explain the observation that would be made when blue litmus paper is dipped into chlorine water that has been exposed to sunlight for some time.


Answers to Questions 2.5.2(b)

  1. Cl2(g)   +   H2O(i)   ⟶   HCl(aq)   +   HOCl(aq)
  2. 2HOCl(aq)   ⟶   2HCl(aq)   +   O2(g)
  3. HOCl(aq)   +   Dye   ⟶   Dye+O   +   HCl(aq)

  4. The colour of chlorine water changes from yellow-green to colourless. Colourlsess gas bubbles are produced.
  5. Blue litmus paper turns red due to presence of hydrochloric acid. No bleaching occurs because chloric (I) acid, which causes bleached, has decomposed into hydrochloric acid.