“盐类水解”是中学化学难点之一。学生运用盐类水解知识处理盐溶液间反应时,存在两种偏向。其一,把初中学习的无机物相互反应的规律绝对化,误认为两种盐溶液的反应都是复分解反应,该考虑水解的不考虑;其二,是犯扩大化的错误。误认为有盐溶液参与的反应,就必须考虑水解,结果水解泛滥成灾。因此,盐溶液间岭反应在什么情况下是复分解反应,在什么情况下是水解反应,成为学生学习水解知识的主要矛盾。一、充分揭示矛盾,调动学生主动性学生在掌握盐类水解概念和三种类型盐水解规 “Salt hydrolysis” is one of the chemical difficulties in middle school. When students use salt hydrolysis knowledge to deal with the inter-saline solution reaction, there are two kinds of bias. For one thing, the laws of the interaction of inorganic substances in junior high schools are absolute, and it is mistaken to assume that the reactions of the two salt solutions are all metathesis reactions. The consideration of hydrolysis is not taken into consideration. Second, it is an error of magnified. If it is mistaken for a reaction in which a salt solution is involved, hydrolysis must be considered, and as a result, the hydrolysis is flooded. Therefore, the salt-solution ridge reaction is a metathesis reaction under what circumstances, and in what case it is a hydrolysis reaction, which becomes the main contradiction for students to learn the knowledge of hydrolysis. First, fully reveal contradictions and mobilize students’ initiative students to master the concept of salt hydrolysis and three types of salt water solution