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Fe2(SO4)3 => 2 Fe^{3+} + 3 SO4^{2-}
Biloks Fe = +3 (sesuai muatannya)
Biloks O = -2 (menurut aturan biloks)
Biloks SO4^{2-} = -2
Biloks S + 4 biloks O = biloks SO4^{2-}
Biloks S + 4(-2) = -2
Biloks S = +6