电子守恒,在氧化还原过程中,总是存在着得电子总数等于失电子总数,在原电池和电解池中通过两极的电子数必然相等。利用这个规律,巧妙选择化学式或溶液中某两种数相等,或几个连续(或平行)的方程式前后某微粒(如离子、原子、电子)的物质的量保持不变作为解题依据,列出关系式解答题目。 Electron conservation, in the redox process, there is always the total number of electrons equal to the total number of missing electrons in the original cell and electrolytic cell through the poles of the number of electrons must be equal. Use this rule, the clever choice of chemical formula or solution of two or more equal, or several continuous (or parallel) before and after the equation of a particle (such as ions, atoms, electrons) the amount of material remains unchanged as the basis for solving the problem, the column Out of the equation to answer the question.