Final answer:
The appropriate formula for the Ksp of a salt that has a general formula of MX2 is (x)^2.
Step-by-step explanation:
The appropriate formula for the Ksp of a salt that has a general formula of MX2 is (x)^2. This is because the solubility product constant, Ksp, is equal to the concentration of the cation squared when the general formula of the salt is MX.