Ka is the ionization equilibrium constant of weak acids.
Kb is the ionization equilibrium constant of a weak base.
Kw is the ionic product constant of water.
Kh is the hydrolysis constant of a weak base cation or a weak acid anion.
Relation: Both are equilibrium constants and are only affected by temperature.
The expression is the ratio of the product of the coefficient of the concentration of the product to the product of the coefficient of the reactant.
What are the equilibrium constants Kd, Kf and how do they relate to each other
The two should not necessarily be related, but the rate at which the chemical equilibrium moves can tell you whether the chemical reaction has moved or not. When the reaction rate in the positive direction is greater than the reaction rate in the reverse direction, it moves forward, and vice versa. Equilibrium is reached when the two are equal.