Chlorine dioxide (CIO_2), which is produced by the reaction below, has been test

Question

Chlorine dioxide (CIO_2), which is produced by the reaction below, has been tested as a disinfectant for municipal water treatment. 2 naClO_2 (aq) + Cl_2(g) + 2 NaCl(aq) Using data from the Standard Reduction Potentials table, calculate DeltaG degree, and K at 25 degree C for the production of CIO2. One of the concerns in using CIO_2 as a disinfectant is that the carcinogenic chlorate ion (CIO_3^- ) might be a by-product. It can be formed from the following reaction.ClO_2(g) rightarrow ClO_3^-(aq) + cl^-(aq) Balance the equation for the decomposition of CIO_2. (Use the lowest possible coefficients. Include states-of-matter at 25 degreeC and 1 atm in your answer. Standard Reduction Potentials at 25 degree C (298 K) for many Common Half - Reactions

Explanation / Answer

Lets balance this reaction by using oxidation and reduction half method.

Oxidation half

ClO2 --- > ClO3-

Reduction half :

ClO2 -- > Cl-

Step 1 :

Balancing of atoms other than O and H

ClO2 -- > ClO3-

ClO2 -- > Cl-

Balancing of Oxygen and H. We add H2O molecule in order to balancing Oxygen and H+ in order to balance Hydrogens.

ClO2 + H2O -- > ClO3- + 2 H+

ClO2 + 4 H+ -- > Cl- + 2 H2O

Charge balancing.

This is done by addition of electrons

ClO2 + H2O -- > ClO3- + 2 H+ +1 e-

ClO2 + 4 H+ + 5 e- -- > Cl- + 2 H2O

Electron balancing

5 ClO2 +5 H2O -- > 5ClO3- + 10 H+ +5 e- )

ClO2 + 4 H+ + 5 e- -- > Cl- + 2 H2O

Addition of both halve

5 ClO2 +5 H2O -- > 5ClO3- + 10 H+ +5 e- )

ClO2 + 4 H+ + 5 e- -- > Cl- + 2 H2O

-----------------------------------------------------------------------

6 ClO2 + 3 H2O + -- > 5 ClO3- + 6H+ + Cl-

Hence the reaction is balanced.

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