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与铁及其化合物有关的众多计算题中,能运用守恒关系解答的题型特别多。解题时,巧用守恒关系,可取得事半功倍的效果。一、质量守恒质量守恒是指参加化学反应的各物质的质量总和等于反应后生成物的质量总和。例1 在2L硫酸铜和硫酸铁的混合溶液中,加入30g铁粉,最后得到2L0.25 mol/L的硫酸亚铁溶液和26g固体沉淀物。求原溶液中硫酸铜和硫酸铁的物质的量浓度各是多少? 解析设硫酸铁和硫酸铜的物质的量分别为x和
Among the many computational problems related to iron and its compounds, the types of questions that can be solved using conservation relations are particularly large. When solving problems, using conservation relations skillfully can achieve a multiplier effect. I. Mass conservation Mass conservation refers to the sum of the mass of each substance participating in a chemical reaction equal to the sum of the mass of the product after the reaction. Example 1 In a mixed solution of 2L copper sulfate and iron sulfate, 30g of iron powder was added, and finally 2L of a 0.25 mol/L ferrous sulfate solution and 26g of a solid precipitate were obtained. What is the amount of each substance of copper sulfate and iron sulfate in the original solution? Analyze that the amount of the substance containing iron sulfate and copper sulfate is x and