Fractional Precipitation Pogil Answer | Key Best ((free))

"Mr. Henderson," said Sarah, the class valedictorian, raising her hand. "Can we go over Question 6? I got stuck on the part where the second precipitate forms."

He walked the class through the calculations. He pointed to the crucial step where the chromate ion concentration is calculated.

value (least soluble) will typically precipitate first when a common ion is added gradually. Solubility Product ( cap K sub s p end-sub

The POGIL activity on fractional precipitation is designed to help students understand the concept of solubility and how it can be used to separate ions. The activity involves a series of questions and exercises that guide students through the process of fractional precipitation.

In a typical POGIL exercise, you are given a solution containing two anions (like Cl−cap C l raised to the negative power CrO42−cap C r cap O sub 4 raised to the 2 minus power ) and told that a cation (like Ag+cap A g raised to the positive power ) is being added slowly.

Ksp=[Ag+][Cl−]cap K sub s p end-sub equals open bracket Ag raised to the positive power close bracket open bracket Cl raised to the negative power close bracket

. It starts to form a precipitate when the reaction quotient exceeds this value (e.g., at