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-1 +6 -2 0
reduksi : SO4^2- + 8 H^+ + 8 e → S^2- + 4 H2O × 1
oksidasi: 2 I^- → I2 + 2 e × 4
SO4^2- + 8 H^+ + 8 I^- → S^2- + 4 H2O + 4 I2
2. S^2- + NO3 → S + NO ( asam)
2- +6 0 +2
reduksi : NO3 + 4 H^+ + 4 e→ NO + 2 H2O × 1
oksidasi : S^2- → S + 2 e × 2
NO3 + 4 H^+ + 2 S^2- → NO + 2 H2O + 2 S
3. CrO4^2- + Fe^2+ → Cr2O3 + Fe^3+ ( basa)
+6 +2 +3 +3
reduksi: 2 CrO4^2- + 10 H^+ + 6 e→ Cr2O3 + 5 H2O × 1
oksidasi: Fe^2+ → Fe^3+ + e × 6
2 CrO4^2- + 10 H^+ + 6 Fe^2+ → Cr2O3 + 5 H2O + 6 Fe^3+