Ksp is the equilibrium constant of precipitation and dissolution, and the expression is the product of the power of ion concentration. For example, ksp (AgCl) = [Ag+] [Cl-];
Ka is the ionization equilibrium constant of acid, and the expression: Ka (HAC) = [H+] [AC-]/[HAC];
Kb is the ionization equilibrium constant of alkali, and the expression: KB (OHAC) = [OH-]/[OHAC];
Kw is the ionic product constant of water, and the expression is: Kw=[H+][OH-].
Extended data:
When writing the balance constant expression, we should pay attention to the following questions:
1. When the expression of equilibrium constant is applied, the concentration of water molecules in dilute solution can be omitted.
2. In the reaction, the amount and concentration of solid matter have no influence on the reaction rate and equilibrium, so it is not necessary to write down the concentration of solid matter.
3. The expression of chemical equilibrium constant is related to the writing method of chemical equation. For the same chemical reaction, the stoichiometry and equilibrium constant of each reaction and product are different because of different writing methods. However, these equilibrium constants can be converted to each other.
4. The large equilibrium constant indicates that the equilibrium concentration of the product is large and the equilibrium concentration of the reactant is relatively small, indicating that the reaction is relatively complete.
5. It is generally believed that the reaction of K> 10 5 is complete (i.e. irreversible reaction), while K
References:
Baidu encyclopedia-chemical equilibrium constant