摘要:30. (2)阳极:Fe -2e-== Fe2+ , 阴极:2H+ + 2e == H2↑ 溶液中:6Fe2+ + Cr2O72 -+ 14H+ == 6Fe3+ + 2Cr3+ + 7H2O (3)2CrO42- + 2H+ Cr2O72- + H2O (5)Cr3+ + 4OH- == CrO2- + 2H2O Fe3+ + 3OH- == Fe(OH)3↓ 3 + 3H+ == Fe3+ + 3H2O

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