1. The problem statement, all variables and given/known data A sample of saturated Ca(OH)2 solution in water is collected in flask #1, filtered into flask #2, then 25.00mL samples were transferred into flasks #3, #4, #5. Which flasks had to be dry and which could be wet? Also, flask #2 was stoppered. Why? 2. Relevant equations 3. The attempt at a solution I think only flask #1 could be wet since it is the only flask that has unfiltered solution. I think flask #2 was stoppered since it was filtered to prevent contamination, but would it affect Ksp if it wasn't stoppered?