Fractional precipitation is a laboratory technique used to separate ions in a solution by adding a reagent that forms a precipitate with one or more of those ions. Because different salts have different solubilities (represented by the solubility product constant, ), they don't all precipitate at the same time.
By carefully controlling the concentration of the precipitating agent, you can force the least soluble salt to drop out of the liquid while keeping the more soluble ions in the solution. Core Concepts You’ll Find in the POGIL 1. The Role of Kspcap K sub s p end-sub Kspcap K sub s p end-sub fractional precipitation pogil answer key
Many "Level 3" POGIL questions ask how much of the first ion remains in solution when the second ion begins to precipitate. To solve this, take the Fractional precipitation is a laboratory technique used to