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物质的比重与它的成分和分子结构有密切关系,它和沸点、熔点、折光率等物理常数一样,作为鉴定未知物的重要依据。一般使用的比重天、比重计、比重管和比重瓶等直接测量法需要试样较多,不能解决点滴试样的比重测定。现将测定微升量试样的比重的方法介绍如下。原理:两互不相溶、不起反应的液体,比重大者沉降于下层;当比重相同时,则不发生沉浮现象,此时测定其中一个液体的比重,即为另一
The proportion of matter with its composition and molecular structure are closely related, and its boiling point, melting point, refractive index and other physical constants, as an important basis for the identification of unknown. The commonly used proportion of days, hydrometer, pycnometer and pycnometer and other direct measurement method requires more samples, can not solve the determination of the proportion of drop samples. The method of determining the specific gravity of a microliter sample is as follows. Principle: two mutual immiscible, can not afford the reaction of liquid, the proportion of the major settlement in the lower; when the same proportion, it does not occur floating phenomenon, this time to determine the proportion of one of the liquid, that is another