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reduktor = S
Hasil oksidasi = SO₂
Hasil reduksi = KCl
Bil. oksida yang sudah pasti
K punya bil. oksidasi +1
O punya bil. oksidasi -2
H punya bil. oksidasi +1
KClO₃ + S + H⁺ --> KCl + SO₂ + H₂O
KClO₃ --> K + Cl + 3O = 0
KClO₃ --> +1 + Cl + -6 = 0
KClO₃ --> Cl = +5
S --> 0 karena berdiri sendiri
H⁺ --> +1 bertanda +
KCl --> K + Cl = 0
KCl --> +1 + Cl = 0
KCl --> Cl = -1
( Cl --> dari +5 jadi -1 = reduksi)
SO₂ --> S + 2O = 0
SO₂ --> S + (-4) = 0
SO₂ --> S = +4
( S --> dari 0 jadi +4 = oksidasi )
H₂O --> 2H + O = 0
H₂O --> 2 + (-2) = 0
Oksidator = KClO₃ --> mengalami reduksi
Reduktor = S --> mengalami oksidasi