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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

What is the overall equilibrium constant for the disproportionation reaction of Cl2 in water?

Interpretation Introduction

Interpretation:

The equilibrium constant K for the reaction has to be determined.

Concept introduction:

  • If the oxidation number of an element increases then the element is said to be oxidized and the oxidation number value of decreases for an element which is reduced.
  • Ecell0=Ecathode0Eanode0
  • In cathode, reduction reaction will take place and in an anode oxidation reaction will happen.
  • The equation to determine the equilibrium constant K by using the value of E0 is,           

  lnK=nE00.0257     n is the number of electrons involved in the reaction

Explanation

   The balanced chemical reaction equation for the given reaction is,

     Cl2(g)+2H2O(l)HClO(aq)+H3O(aq)++Claq

Oxidation number for each element involved in the reaction can be written as follows,

         Cl2(g)0+2H2O(l)0HClO(aq)+1+12+H3O(aq)++Claq1

Reduction reaction in cathode is,

Cl2+2e2Cl                            Ecathode0=1.36V

Oxidation reaction in anode is,

Cl2+2H2O2HClO+2H++2e                    Eanode0=1

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