Fractional precipitation is a laboratory technique used to separate two or more ions in a solution by adding a reagent that forms a precipitate with each ion. Because different salts have different solubilities, one will crash out of the solution (precipitate) before the other. Step 1: Identify the Kspcap K sub s p end-sub The first part of your POGIL likely asks you to compare Kspcap K sub s p end-sub

, the less soluble the substance is. In a fractional precipitation scenario, the compound with the lowest Kspcap K sub s p end-sub

Ksp=[Zn2+][CO32−]cap K sub s p end-sub equals open bracket Zn raised to the 2 plus power close bracket open bracket CO sub 3 raised to the 2 minus power close bracket