【问题的原由】一道电解质溶液方面的经典试题被各类考试广泛采用,该题学生答题出错率非常之高,原题提供的答案也很单一。笔者研究发现,题目之所以经典,在于题目涉及了多组易混淆概念,限制条件多,迷惑程度高,问题设计上不仅要知其然,还要知其所以然,对审题要求极高。笔者对其进行了探究,发现其答案其实是丰富多彩的。【原题】A、B两种物质都是由氢、氮、氧、钠四种元素中的任意三种元素组成,它们的水溶液分别呈酸性或碱 】 【The cause of the problem A classic electrolyte solution test questions are widely used in various exams, the problem of student answer error rate is very high, the original answer provided by the answer is very simple. The author found that the reason why the title is classic is that the subject involves multiple groups of confusable concepts, with many restrictions and a high degree of confusion. The design of the problem not only needs to be known, but also the reason why it is so demanding. The author explored it and found that the answer is actually rich and varied. 【Original】 A, B two substances are by hydrogen, nitrogen, oxygen, sodium four elements of any three elements, their aqueous solution were acidic or alkaline