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  • Chlorine is used to purify drinking water Excess of chlorine is harmful The excess of chlorine is removed by treating with sulphur dioxide

8.23  Chlorine is used to purify drinking water, but excess chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water

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Answer-

Base equation-  SO_{2}+Cl_{2}\rightarrow Cl^{-}+SO_{4}^{2-}--------------(have to remember)

Now we have to balance the oxidation half and reduction half.

oxidation half = SO_{2}\rightarrow SO_{4}^{2-}

Balance: Oxygen is balanced by adding water molecules; Hydrogen is balanced by H^{+} ion and for charge, add e^{-}(electron)SO_{2} +2H_{2}O\rightarrow SO_{4}^{2-}+4H^{+}+2e^{-}

Reduction half= Cl_{2}\rightarrow Cl^{-}

Balancing: to balance charge, add an electron   Cl_{2}+2e^{-}\rightarrow 2Cl^{-}

Now add both the balanced oxidation half and reduction half, and we get 

Cl_{2}+SO_{2}+2H_{2}O\rightarrow 2Cl^{-}+SO_{4}^{2-}+4H^{+}

Posted by

Gautam harsolia

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