Chapter 11, Problem 42E

Chlorine dioxide ${\text{(ClO}}_{\text{2}}\text{)}$ , which is produced by thereaction
${\text{2NaClO}}_{\text{2}}\text{(}aq{\text{)+Cl}}_{\text{2}}\text{(}g\text{)}\to {\text{2ClO}}_{\text{2}}\text{(}g\text{)+2NaCl(}aq\text{)}$
has been tested as a disinfectant for municipal watertreatment.
a. Using data from Table 11.1, calculate $\Delta G°$ , andK at 25°C for the production of ${\text{ClO}}_{\text{2}}$ .
b. One of the concerns in using ${\text{ClO}}_{\text{2}}$ as a disinfectantis that the carcinogenic chlorate ion ${\text{(ClO}}_{\text{3}}{}^{\text{–}}\text{)}$ mightbe a by-product. It can be formed from the reaction
${\text{ClO}}_{\text{2}}\text{(}g\text{)}\rightleftharpoons {\text{ClO}}_{\text{3}}{}^{\text{–}}\text{(}aq{\text{)+Cl}}^{–}\text{(}aq\text{)}$
Balance the equation for the decomposition of ${\text{ClO}}_{\text{2}}$ .