Write the dissolution equation for the salt
Write the Ksp expression
Let the molar solubility be x
Express ion concentrations in terms of x using stoichiometric coefficients
Substitute the expressions into the Ksp equation
Solve for x
Use x as the molar solubility in mol/L
If common ions are present, include their initial concentrations in the Ksp setup
If the salt has a very small Ksp, check whether approximations are valid
Convert to other units only if needed