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课外中指出在盐酸介质中用高锰酸钾滴定Fe~+时,由于反应Mn O~-_4+5Fe~(2+)+8H~+=Mn~(2+)+5Fe~(3+)+4H_2O……(1)的诱导作用,可以加快高锰酸钾氧化Cl~-的反应,2Mn O~-_4+10Cl~-+16H~+=2Mn~2+5Cl_2+8H_2O……(2)
It is pointed out in extra-curricular that when Fe ~ + is titrated with potassium permanganate in hydrochloric acid medium, the reaction of MnO ~ -_4 + 5Fe ~ (2 +) + 8H ~ + = Mn ~ (2+) + 5Fe ~ (3+) + 2H 2 O (1) can accelerate the Cl ~ - reaction of potassium permanganate, and the reaction of 2Mn O ~ -_4 + 10Cl ~ - + 16H ~ + = 2Mn ~ 2 + 5Cl_2 +