自从进入《选四》的平衡理论部分,“常数”就与平衡相伴而生,每一种平衡体系中必然伴随着常数。由于每一种“常数”都是在平衡体系下建立的,而每一种平衡体系之间又有相似之处,所以使得每一种常数之间存在着某些相似性;不同条件下建立的平衡体系不同,又使得每一种常数的适用范围、意义及应用方面有所不同。1.每一种常数都是在一定温度下,一个反应本身固有的内在性质的定量体现,都是表示可逆反应进行程度的特性常数。化学平衡常数是指在一定温度下,当一个可逆反应达到化学平衡时,生成物浓度幂之积与反应物浓度幂之积的比值是一 Since entering the balanced theory part of “Selected Four”, “constant ” has come with the balance, and every equilibrium system must be accompanied by a constant. Because each kind of “constant ” is established under the equilibrium system, and there are similarities between each of the equilibrium systems, so there is some similarity between each kind of constant. Under different conditions Different equilibrium systems are established, which in turn makes the scope, meaning and application of each constant different. 1. Each constant is a quantitative reflection of the inherent properties of a reaction itself at a certain temperature, all of which are characteristic constants that indicate the extent of reversible reaction. Chemical equilibrium constant refers to the temperature at a certain temperature, when a reversible reaction reaches a chemical equilibrium, the ratio of the product of the product of the power of concentration and the concentration of reactant concentration is a