We’re being asked to calculate the Ksp 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 Ksp at this temperature. After you get your answer, take the negative log and enter that (so it's like you're taking the pKsp). (Note: sulfate ion molar mass = 96.07 g/mol)