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鉴别是对已知物的种类进行辨认,其目的在于把几种物质区别开来。一般说来,不需要将鉴别物质逐一进行检验,这和鉴定不同。鉴定是用实验方法,鉴定物质的组成,然后确定物质是什么,或该物质中含有哪些成分。现谈谈鉴别物质的20种方法。 1.沉淀法待鉴别物质的溶液中,加入某种试剂,观察是否有沉淀产生,进行鉴别。例:如何鉴别Na_2SO_4溶液和NaNO_3溶
Identification is the identification of known species, the purpose of which is to distinguish several substances. Generally speaking, there is no need to test the identification substances one by one, which is different from the identification. Identification is the use of experimental methods to identify the composition of a substance and then determine what the substance is or what components it contains. Now talk about 20 ways to identify substances. 1. Precipitation method The solution of the substance to be identified is added with a certain reagent to observe whether there is precipitation or not. Example: How to identify Na_2SO_4 solution and NaNO_3 solution