(3)C2O2的氧化性 E(C2O7/Cr)=1.33V Cro t3so2t8Ht->3S02+2Crt+4hO Cro+3hst8ht-3s+2Crt+Zho Cr,O2+6Ⅰ+14H+—>3I+2Cr3+7H,O K2Cr2O2(s)+14HCk浓)—>3Cl2+2CrCl +2KCl+ Zh.o C0O7+6Fe2++14H+>6Fe+2Cr3+7H2O H2O CrO2+3Sn2++14H+>3Sn4+2Cr3++7H(3)Cr2O7 2-的氧化性 C r O 3Sn 14H 3Sn 2Cr 7H O C r O 6Fe 14H 6Fe 2Cr 7H O 2KCl 7H O K C r O (s) 14HCl( ) 3Cl 2CrCl C r O 6I 14H 3I 2Cr 7H O C r O 3H S 8H 3S 2Cr 7H O C r O 3SO 8H 3SO 2C r 4H O (Cr O /Cr ) 1.33V 2 2 2 4 3 2 7 2 2 2 3 3 2 7 2 2 2 7 2 3 2 3 2 2 2 7 2 3 2 2 2 7 2 2 3 4 2 3 2 2 7 2 3 2 7 + + ⎯→ + + + + ⎯→ + + + + + ⎯→ + + + ⎯→ + + + + ⎯→ + + + + ⎯→ + + = − + + + + − + + + + − − + + − + + − − + − + − + 浓 E