Fractional Precipitation Pogil Answer Key Best Verified Jun 2026

For AgCl: ([Ag^+] = \frac1.8 \times 10^-100.010 = 1.8 \times 10^-8 , M)

| Misconception | Reality | |---------------|---------| | Lower Ksp always means precipitates first | Only if ion concentrations are equal. If [I⁻] is extremely low, [Cl⁻] high, AgCl might precipitate first despite higher Ksp. | | Precipitation is instantaneous and complete | Precipitation is dynamic; ions remain in equilibrium with solid. “Complete” means <0.1% remains. | | You can perfectly separate any two ions | Separation is successful only if Ksp difference is large (>10⁴ factor). | fractional precipitation pogil answer key best

of the first ion remains when the second begins to precipitate. UCI Department of Chemistry Best Practices for Completing the POGIL 17.6: Fractional Precipitation - Chemistry LibreTexts For AgCl: ([Ag^+] = \frac1

By the time AgCl starts to precipitate, the [I⁻] has dropped from 0.010 M to (4.7 \times 10^-9 M). That’s a decrease by a factor of over 2 million. The separation is essentially complete. “Complete” means &lt;0

)—the product of the actual ion concentrations—exceeds the cap K sub s p end-sub of the compound ( Order of Precipitation : The compound with the lowest solubility