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2Cr + 3CuSO4 -> Cr2(SO4)3 + 3Cu
Reaktan : biloks Cr = 0
biloks Cu = 2+
biloks SO 4 = 2-
Produk : biloks Cr = 3+
biloks SO4 = 2-
biloks Cu = 0
ada peningkatan junmlah biloks Cr (rekasi oksidasi) ada penurunan biloks Cu (reaksi reduksi)