Hi, We did a lab the other day involving the calculation of Ksp values. Objective of the lab was to calc the Ksp of CaSO4 by several methods and to determine which method would give the most consistent/accurate value for the solubility product constant. Heres what we did: A) 1. Filter 100.0 mL of saturated CaSO4 solution into a beaker. 2. Add 1.00 mL of 0.10 mol/L HCl solution and warm the soution to near boiling. 3. Add 10.0 mL of a 0.20 mol/L BaCl2 solution with stirring. Cover and set aside for 24hr. 4. Filter the mixture and collect precipitate. 5. Dry precipiate and mass. B) repeat A but omit the addition of acid and heating. Also filter the precipitate right after reaction occurs. C) 1. Mix 20.0 ml of .50 mol/L CaCl2 solution with 20.0 mL of .50 mol/L Na2SO4 solution. 2. Add 5.0 mL of .10 mol/L HCl and dilute to 500 mL with distiled water. 3. Filter the mixture and collect precipitate. 4. Dry precipiate and mass. D) repeat C but omit the addition of acid. I need help thinking of good errors that occured whille conductiong the experiament and why our results would be off. Thanks a lot guys, this is my first time here and it seams like a nice community.