Solubility product which is denoted by is a type of equilibrium constant at the saturated level of solution.
It is dependent on the temperature of the system.
Solubility is the amount of solute dissolved in a definite amount of solvent to form saturated solution at particular temperature.
Step 2: Expression of for
A general equation of equilibrium constant for a reaction of dissociation of as can be written as,
Where, is the equilibrium constant , and are the concentration of , and respectively.
But we know that is the equilibrium constant at the saturated level. At saturation, no more will dissolve. Thus the concentration of will be constant and can be taken as 1.
Therefore the above equation can be written as,
Now consider the solubility of the salt is . Then at saturation the solubility for the reaction can be represented as below,
Therefore,
Thus the expression for the salt is or we can say .