将0.84克铁完全溶解在100毫升1摩尔每升稀H2SO4中,然后加入K2CR2O7溶液25毫升,恰好使溶液中的FE2+全部氧
化为CR3+,则K2CR2O7溶液的物质的量浓度是多少
人气:251 ℃ 时间:2020-05-19 02:00:45
解答
首先题目中有个地方打错了,应为全部氧化为Fe3+
根据反应列出比例关系
3Fe~3Fe(2+)~Cr2O7(2-)~Cr(3+)
由题意知,铁的物质的量为0.015mol
所以Cr2O7(2-)得物质的量为0.005mo
又K2CR2O7溶液25毫升
所以K2CR2O7溶液的物质的量浓度为0.2mol/L
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