现行中学化学教材中,对SO_4~(2-)的检验不管是在理论上还是实践中,都是非常重要的。书中对SO_4~(2-)的检验是这样阐述的:“用可溶性钡盐溶液和盐酸(或稀硝酸)可以检验SO_4~(2-)的存在”。对这句话的理解和教学,笔者认为应考虑一些具体情况下操作上的可行性,即必须考虑一些中学化学中常见的阳离子和阴离子的影响。鉴于中学化学的学习水 The current middle school chemistry textbook, the SO_4 ~ (2-) test, whether in theory or practice, are very important. The book SO_4 ~ (2-) test is described as follows: “The use of soluble barium salt solution and hydrochloric acid (or dilute nitric acid) can test the presence of SO_4 ~ (2-) ”. Understanding and teaching of this sentence, I believe that we should consider the operational feasibility of a number of specific circumstances, that is, we must consider some of the common chemistry in secondary schools, the impact of cations and anions. Given the high school chemistry learning water