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) rightarrow 2 ClO_2(g) + 2 NaCI(aq) Using data from the Standard Reduction Potentials table, calculate degree,deltaGdegre, and K at 25degreeC for the production of CIO_2. 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 CO_3-(aq) + C-(aq) Balance the equation for the decomposition of CIO_2. (Use the lowest possible coefficients. Include states-of-matter at 25degreeC and 1 atm in your answer.)

Explanation / Answer

(a) Eo = 1.36 - (-1.19) - 2.55 V

dGo = -nFEo = -2 x 96485 x 2.55 = -492.07 kJ/mol

dGo = -RTlnK

-492070 = -8.314 x 298 lnK

K = 1.80 x 10^86

(b) ClO2(g) ---> ClO3-(aq) + Cl-(aq)

balance Cl,

2ClO2 ---> ClO3- + Cl-

balance O,

2ClO2 ---> ClO3- + Cl- + H2O

balance H,

2ClO2(g) + 2H+(aq) ---> ClO3-(aq) + Cl-(aq) + H2O(l)

Is the final balanced equation

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