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Cl~-的检验是中学化学中的热点问题,在历年各省市的高考题中出现的频率较高。但纵观各年各省市关于该知识点的考查,都是在回避同一个问题,那就是Cl~-检验中SO_4~(2-)的干扰问题。教材上的检验方法能否排除SO_4~(2-)的干扰,这一直是长期困扰高中一线教师的问题之一。教材中对于Cl~-的检验方法在人教版必修1第8面的原文描述如下:滴几滴稀硝酸和几滴AgNO_3溶液;而
The test of Cl ~ - is a hot issue in middle school chemistry. It appears frequently in entrance exams of provinces and cities over the years. However, a survey of all provinces and municipalities on this point of knowledge over the years is to avoid the same problem, that is, the interference problem of SO_4 ~ (2-) in the Cl ~ - test. It is one of the problems long plagued the front-line teachers in high school that the test methods on the teaching materials can eliminate the interference of SO_4 ~ (2-). Textbook for Cl ~ - test method in the PEP 1 compulsory 8th page of the original text is described as follows: a few drops of dilute nitric acid and a few drops of AgNO_3 solution; and