: The concentration of the least soluble ion (e.g., Cu2+cap C u raised to the 2 plus power ) drops sharply as it forms a precipitate.
Fractional Precipitation POGIL (2021) focuses on separating multiple cations from an aqueous mixture by taking advantage of their different solubility product constants ( cap K sub s p end-sub fractional precipitation pogil answer key 2021
"What concentration of the first ion remains when the second ion begins to precipitate?" To solve this: Identify the concentration of the reagent (e.g., ) at the exact moment the precipitate starts to form. Plug that value back into the cap K sub s p end-sub expression of the substance. Solve for the remaining concentration of the first ion. 4. Why Use This in the Real World? : The concentration of the least soluble ion (e
To find the answer key's logic for "at what concentration does precipitation begin," use the formula: Solve for the remaining concentration of the first ion
So close the search tab. Open the POGIL worksheet. Calculate the first [X⁻] for each ion. Plot the log[C] vs volume added. And when you finally get the answer—whether it matches the 2021 key or not—you’ll own that chemistry forever.
: As the first ion precipitates, its concentration in the solution decreases significantly.
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