# Problem: Chlorine dioxide (ClO2), which is produced by the reaction 2NaClO2 (aq) + Cl2 (g) → 2ClO2 (g) + 2NaCl (aq)has been tested as a disinfectant for municipal water treatment. Using data from Table 17‑1, calculate E° and ΔG° at 25°C for the production of ClO2.

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###### FREE Expert Solution

Calculate E°cell.

Recall:

Lose               Gain
Electron         Electrons
Oxidation       Reduction

cathode → reduction → oxidation number decreases

anode → oxidation → oxidation number increases

For ions: charge of the ion = oxidation number
For neutral atoms/compound: oxidation number = 0

We have:

ClO2- ClO(oxidation number decreases)

Cl→ 2 Cl- (oxidation number decreases)

From the reduction potential table, we have:

ClO+ e- → ClO2-                             E°cell = 0.954 V                           anode

Cl+ 2 e- → 2 Cl-                              E°cell = 1.36 V.                            cathode

$\overline{){\mathbf{E}}{{\mathbf{°}}}_{{\mathbf{cell}}}{\mathbf{=}}{\mathbf{E}}{{\mathbf{°}}}_{{\mathbf{cathode}}}{\mathbf{-}}{\mathbf{E}}{{\mathbf{°}}}_{{\mathbf{anode}}}}\phantom{\rule{0ex}{0ex}}\mathbf{E}{\mathbf{°}}_{\mathbf{cell}}\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{36}\mathbf{V}\mathbf{-}\mathbf{0}\mathbf{.}\mathbf{954}\mathbf{V}$ ###### Problem Details

Chlorine dioxide (ClO2), which is produced by the reaction

2NaClO2 (aq) + Cl2 (g) → 2ClO2 (g) + 2NaCl (aq)

has been tested as a disinfectant for municipal water treatment. Using data from Table 17‑1, calculate E° and ΔG° at 25°C for the production of ClO2. 