Fractional Precipitation Pogil: Answer Key ^new^
The Art of Separation: Unlocking the ‘Fractional Precipitation’ POGIL Answer Key
Explanation:
Effective separation requires the Ksp values to differ by several orders of magnitude (e.g., 10⁴ or more). Here, the ratio is ~1.6×, so co-precipitation occurs.
Sodium Carbonate
The activity typically uses a model featuring a mixture of metal ions (like Zn2+cap Z n raised to the 2 plus power Cu2+cap C u raised to the 2 plus power ) to which ( Na2CO3cap N a sub 2 cap C cap O sub 3 ) is added. Fractional Precipitation: Separating Cations in Solution fractional precipitation pogil answer key
The one with the smallest required concentration precipitates first. Chemistry LibreTexts 3. Calculate Remaining Ion Concentration Ksp: Ag₂S = 6×10⁻⁵⁰, PbS = 8×10⁻²⁸, HgS
Q:
What if we used Na₂S instead of HCl? Ksp: Ag₂S = 6×10⁻⁵⁰, PbS = 8×10⁻²⁸, HgS = 4×10⁻⁵³. A: All Ksp values are extremely small, but HgS (smallest) precipitates first, then Ag₂S, then PbS. However, all will precipitate almost instantly—poor separation. Ksp: Ag₂S = 6×10⁻⁵⁰