对于弱酸或弱碱,溶液的电离度与其浓度平方根成反比,即浓度越稀,电离度越大,这个关系式叫作稀释定律,可表示为α=(K/C)~(1/2)。从上式可以看出,当无限稀释时,C→0,则α→∞。很明显,这一结论是不合理的。这说明稀释定律的关系式是有条件的,当无限稀释时,该关系式已不再适用。本文对极稀溶液中一元、二元弱酸电离度的关系式进行了推导。根据所得的新关系式可发现,在无限 For weak acid or weak alkali, the ionization degree of the solution is inversely proportional to the square root of the concentration, ie, the concentration is thinner and the ionization degree is larger. This relation is called the dilution law and can be expressed as α = (K / C) ~ (1/2) . As can be seen from the above equation, when infinite dilution, C → 0, then α → ∞. Obviously, this conclusion is unreasonable. This shows that the relationship between the dilution of the law is conditional, when the infinite dilution, the relationship is no longer applicable. In this paper, we have deduced the relationship between the monolayer and binary weak acid ionization in very dilute solution. According to the new relationship obtained can be found in infinity