We have stressed the relationship between E° values and thermodynamic properties. We can use this relationship to add some missing features to an electrode potential diagram. For example, note that ClO₂(g), which has Cl in the oxidation state +4, is not included in Figure 22-4. Using data from Figure 22-4 and Appendix D, add ClO₂(g) to the electrode potential diagram for acidic solutions, and indicate the E° values that link ClO₂(g) to ClO₃^–(aq) and to HClO₂(aq).

Figure 22-4 

Acidic solution ([H+] = 1 M): +7 +5 CIO4 1.189 V CIO4 CIO3 0.374 V Basic solution ([OH-]= 1 M): +7 +5 1.181 V CIO3 (?) +3 HCIO +3 -CIO 0.488 V 1.645 V (?) 1.450 V 0.681 V (?) +1 HOCI +1 1.611 V 0.421 V OCI - 0 1.358 V Cl- 0 1.358 V Cl- 0.890 V -1 CIT -1 CI T