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目前对物质B浓度(C_B)表示方法不够严格,也不规范,各种书刊普遍存在的问题是只标出浓度,而不标出基本单元,使读者发生误解.有的把物质B浓度与克分子浓度混同起来;有的具有相同质量浓度(例:溴酸钾2.78g/L),为什么在《中国药典1905版》标的是0.01667mol/L;而在GB601-88《化学试剂基础标准》标的是0.1mol/L,不能理解;有的甚至片面指出前者是正确的,后者是错误的.本文就以上存在问题,从什么是物质的量、摩尔质量,为什么和怎样确定基本单元入手,指出了在表示物质B浓度时必须指明基本单元,才不致于混淆和误解.
At present, the substance B concentration (C_B) means that the method is not strict and normative, and the common problem in various books and periodicals is that only the concentration is marked without identifying the basic unit, which causes the reader to misunderstand. Molecular concentration mixed together; some with the same mass concentration (for example: potassium bromate 2.78g / L), why the “Chinese Pharmacopoeia 1905 version of the” standard is 0.01667mol / L; and in GB601-88 “basis of chemical reagents,” the standard is 0.1 mol / L, can not understand; some even point out that the former is correct, the latter is wrong.This article has the above problems, from what is the amount of material, the molar mass, why and how to determine the basic unit, pointed out that the Substance B concentration must indicate the basic unit, it will not be confused and misunderstood.