If you are stuck on a specific model in the worksheet, follow these steps:
This isn't just a classroom exercise. Fractional precipitation is vital in: Wastewater Treatment: Removing toxic heavy metals one by one. Chemical Manufacturing: Purifying reagents by removing specific contaminants. Forensics and Analysis: Identifying the presence of specific halides in a sample. Troubleshooting Your Answers When checking your work against a key, keep an eye on stoichiometry . If your salt is cap A g sub 2 cap C r cap O sub 4 , remember that your cap K sub s p end-sub expression is fractional precipitation pogil answer key 2021
of its original value before the second ion begins to precipitate. Common POGIL Example Scenarios Lower Kspcap K sub s p end-sub Compound First to Precipitate Zn2+cap Z n raised to the 2 plus power and Cu2+cap C u raised to the 2 plus power with CO32−cap C cap O sub 3 raised to the 2 minus power Copper(II) Carbonate CuCO3cap C u cap C cap O sub 3 Cl−cap C l raised to the negative power and CrO42−cap C r cap O sub 4 raised to the 2 minus power with Ag+cap A g raised to the positive power Silver Chloride ( ) AgClcap A g cap C l Ba2+cap B a raised to the 2 plus power and Sr2+cap S r raised to the 2 plus power with SO42−cap S cap O sub 4 raised to the 2 minus power Barium Sulfate ( ) BaSO4cap B a cap S cap O sub 4 Where to Find Full Resources If you are stuck on a specific model