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发布日期:2021-01-28
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不纯的碘化钾试样0.518g,用0.194g K 2Cr 2O 7(过量的)处理后,将溶液煮沸,出去析出的碘,然后再加入过量的KI处理,这时析出的碘用c(Na 2S 2O 3)=0.1000 mol·L -1的Na 2S 2O 3标准溶液10.00mL滴定至终点。计算试样中KI的质量分数。
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