The electrode potential diagram for manganese in acidic solutions in Figure 23-14 does not include a value of E° for the reduction of MnO₄^– to Mn²⁺. Use other data in the figure to establish this E°, and compare your result with the value found in Table 19.1.

Figure 23-14

Table 19.1

Transcribed Image Text:

Acidic solution ([H+] = 1 M): +7 +6 MnO (purple) 0.56 V 0.56 V MnO4 (purple) -MnO42- (green) 1.70 V Basic solution ([OH-] = 1 M): +7 +6 +5 2.27 V - MnO4²- (green) 0.27 V +4 -MnO₂ (black) - MnO4³- (blue) 0.62 V 0.95 V 0.96 V +4 +3 MnO₂- (black) Mn3+. (red) 1.23 V -0.2 V 1.49 V +3 Mn(OH)37 (brown) -0.04 V 0.15 V +2 -1.18 V Mn²+ (pale pink) +2 -1.55 V -Mn(OH)₂ (pink) Mn Mn