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近日,我在网上发现有这样一道练习题,并在周练中加以引用。试题题目:将1molCl2通入2L0.4mol/L的FeBr2溶液,最终溶液中存在哪些离子?各自的物质的量分别为多少?试题分析:Cl2具有氧化性,而Fe2+,Br-都具有还原性,那Cl2先氧化谁呢?解题的关键是比较Fe2+,Br-的还原性强弱。当同一种氧化剂与多种还原剂反应时,优先氧化还原性强的物质。因为Fe2+的还原性大于Br-的,所以优先氧化Fe2+。优先发生反应:
Recently, I found on the Internet such an exercise, and in practice to be cited in the week. Test questions: 1molCl2 into 2L0.4mol / L FeBr2 solution, which ions are present in the final solution? The amount of their respective substances were? Analysis of the test: Cl2 with oxidation, and Fe2 +, Br- have a reduction, That Cl2 oxidation who? Problem-solving is the key to compare the reduction of Fe2 +, Br- strength. When the same oxidant and a variety of reducing agent reaction, priority redox strong material. Since Fe2 + is more reducible than Br-, Fe2 + is preferentially oxidized. Preferential reaction: