We’re being asked to **calculate the K _{sp} of calcium sulfate and express the answer as the negative logarithm.**

We go through the following steps to solve the problem:

Step 1. Identify the formula of the compound

Step 2. Calculate the molar solubility

Step 3. Calculate Ksp

Step 4. Calculate pKsp

The solubility of calcium sulfate at a given temperature is 0.01548 g/L. Calculate the K_{sp} at this temperature. After you get your answer, take the negative log and enter that (so it's like you're taking the pK_{sp)}. (Note: sulfate ion molar mass = 96.07 g/mol)