化学试题中常见到一类涉及多步反应的例子。如氢氧化钠溶液和氯化铝溶液混和;二氧化碳通入石灰水中;硫化氢在氧气中燃烧;二氧化氮和氧气混和后倒置于水中等。这类试题要判断生成物的成分和可能剩余的反应物,难度较大。我不满足按一般的将反应进行分步讨论的方法讲解,而是尝试从化学方程式(离子方程式)配平角度来分析问题,试题讲解 One example of a multistep reaction is common in chemical test questions. Such as sodium hydroxide solution and aluminum chloride solution mixed; carbon dioxide into the lime water; hydrogen sulfide in the oxygen combustion; nitrogen dioxide and oxygen mixed and poured into water and so on. It is more difficult for such questions to determine the composition of the product and possible remaining reactants. I am not satisfied with the general method of discussing the reaction step by step, but try to analyze the problem from the perspective of the chemical equation (ion equation).