定“1”法其实是一种数学思维方式,在氧化还原反应方程式的配平及离子方程式的书写中巧妙应用,可使一些复杂问题简单化。在氧化还原反应中,针对一些特殊情况,如被氧化或被还原的元素为两种或两种以上,且存在于同一物质中时,就可作如下处理:例如,将过量的氯气通入Fe Br2溶液中,由于Fe2+和Br-都具有还原性,Fe2+和Br-都完全被氧化,因此可以以Fe Br2为基准,取其物质的量为1 mol,再依据电子守恒,1mol Fe Br2完全被氧化失去3 mol电子,所以Cl2给定系数为 The “1 ” method is actually a mathematical way of thinking, clever use of the redox equation of balance and ion equation writing, can make some complex problems simple. In the redox reaction, for some special cases, such as the oxidation or reduction of two or more elements, and when present in the same substance can be treated as follows: For example, the excess chlorine into the Fe Br2 solution, Fe2 + and Br- are completely oxidized due to the reducibility of both Fe2 + and Br-. Therefore, the amount of Fe2 + and Br- can be 1 mol based on Fe2Br, and then 1 mol of Fe2Br Oxidation loss of 3 mol electrons, so Cl2 given coefficient