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先はH20+SO2=H2SO3NH4+H2O=NH3.H2Oその後H2SO3+NH3.H2O=NH4HSO3+H2O
まずFeO4n-のn=2、鉄は六価なので、塩素によると二価、鉄は高3価2Fe(OH)3ClO-+4OH-=2FeO4 2-+3Cl-+5H2O
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