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oksidasi: 2 I⁻ --> I₂ + 2 e
reduksi (x1): SO₄²⁻ + 8 H⁺ + 8 e --> S²⁻ + 4 H₂O
oksidasi (x4): 8 I⁻ --> 4 I₂ + 8 e
reaksi total: SO₄²⁻ + 8 H⁺ + 8 I⁻ --> S²⁻ + 4 H₂O + 4 I₂
koefisien ion H⁺ = 8