Factors affecting salt water hydrolysis

The hydrolysis equilibrium of salt is also a kind of chemical equilibrium, so the factors affecting the hydrolysis equilibrium can be discussed from the equilibrium constant Kb ^Θ and changing the reaction quotient
.

First, the influence of the dissociation constant of weak acid and weak base
.
The size of the dissociation constant Ka ^Θ or Kb ^Θ determines the size of the hydrolysis equilibrium constant Kh ^Θ of the salt.

Second, the influence of temperature
.
The hydrolysis of salt is generally an endothermic process, △H>0, by the formula

When the temperature increases, the equilibrium constant Kh ^Θ increases
.
Therefore, increasing the temperature can promote the progress of the hydrolysis

Changing the reaction quotient can be reflected in the concentration and acidity
.
According to the principle of equilibrium movement, dilution is conducive to the progress of hydrolysis, so the dilute the solution, the more thorough the hydrolysis