Acid condition | |
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(a) Fe3+ + e− = Fe2+ | E0 = 0.771 V |
(b) O2 + 4H+ + 4e− = 2H2O | E0 = 1.229 V |
(c) Cr2O72− + 14H+ + 6e− = 2Cr3+ + 7H2O | E0 = 1.33 V |
(d) HCrO4− + 7H+ + 3e− = Cr3+ + 4H2O | E0 = 1.35 V |
Basic condition | |
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(a) Cr(OH)3 + 3e− = Cr +3OH− | E0 = − 1.48 V |
(b) CrO2− +2H2O + 3e− = Cr +4OH− | E0 = − 1.2 V |
(c) Fe(OH)2 + 2e− = Fe + 2OH− | E0 = − 0.877 V |
(d) Fe(OH)3 + e− = Fe(OH)2 + OH− | E0 = − 0.56 V |
(e) CrO42− + 4H2O + 3e− = Cr(OH)3 + 5OH− | E0 = − 0.13 V |
f) O2 + H2O + 4e− = 4OH− | E0 = 0.401 V |