一、浓度的概念与符号浓度一词,只指物质的量浓度,用于代替过去的体积克分子浓度、摩尔浓度、克当量浓度等概念。浓度定义为物质的量除以混合物的体积,对于溶液来说,物质 B 的浓度即为物质B 的物质的量 n(B)除以溶液的体积 V。c(B)=n(B)/V。它的另一符号是:[B]。这些符号中的 B 系指物质的基本单元,可以是分子、原子、离子或其特定组合。它不一定是客观存在的粒子,例如用半个钙离子作为基本单元来表达其浓度, First, the concept of concentration and the symbol concentration refers to the concentration of substances, used to replace the past volume concentration of the molecule, molar concentration, gram equivalent concentration and other concepts. Concentration is defined as the amount of material divided by the volume of the mixture. For a solution, the concentration of substance B is the amount of substance, n (B), of substance B divided by the volume, V, of the solution. c (B) = n (B) / V. Another sign of it is: [B]. The B in these symbols refers to the basic unit of matter, which can be a molecule, an atom, an ion, or a particular combination thereof. It does not have to be an objective particle, for example, using half a calcium ion as its basic unit to express its concentration,