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氧化还原反应方程式的配平通常采用氧化数法和离子——电子法,对复杂的反应往往需要反复调整系数,初学者常感到困难,现介绍一种简单易学的方法——待定系数法.这种方法先根据反应前后各元素原子数相等的原则,由涉及分子式最少的元素开始,逐次设定各分子式的系数,建立各系数间的关系式,从而求出各待定系数,最后根据参加反映的元素氧化变化相等的原则,加以验证.
Oxidation reaction equation is usually balanced by oxidation number method and ion-electron method, the complex reaction often requires repeated adjustment coefficient, beginners often feel difficult, now introduced a simple and easy to learn method - to be determined coefficient method. According to the principle that the number of atoms in each element before and after the reaction is equal, starting from the element involving the least number of elements, the coefficient of each formula is set one by one, and the relationship between the coefficients is established to obtain the coefficients to be determined. Finally, The principle of equal change of oxidation is verified.