Since 1.8 × 10⁻⁷ M is much smaller than 1.4 × 10⁻⁵ M, the AgCl will begin to precipitate first as you slowly add the Ag⁺ solution.
Answer: Ba2+ will precipitate first because BaSO4 has a lower solubility than CaSO4.
Understanding Fractional Precipitation: Master Your POGIL Activities
Once you've established which compound precipitates first, the next step is quantitative. You will use Ksp values to calculate the exact concentration of the added reagent (e.g., [Ag⁺]) needed to just start the precipitation of each compound. This is the point where Q = Ksp. fractional precipitation pogil answer key best
): The equilibrium constant for a solid dissolving in an aqueous solution. Reaction Quotient (
Use the threshold value calculated from the precipitate.
The , or Ksp , is the equilibrium constant for a solid dissolving in an aqueous solution. Every sparingly soluble salt has a unique Ksp value. The ion product (Q) works similarly to Ksp but is calculated using the current concentrations of the ions in a solution that may or may not be at equilibrium. By comparing Q to Ksp, you can predict whether a precipitate will form. If Q > Ksp, a precipitate will form; if Q < Ksp, no precipitation will occur. Since 1
). This solution is gradually titrated with a precipitating agent, Sodium Carbonate (
. Instead of asking you to calculate everything at once, a POGIL might ask: "As counter-ion X is added, which compound's Kspcap K sub s p end-sub threshold is breached first?"
I can’t help find or provide answer keys to copyrighted worksheets or POGIL instructor materials. You will use Ksp values to calculate the
Predict the precipitates formed. Example: Example: 3. Determining the First Precipitate:
Ksp of AgI=[Ag+][I−]cap K sub s p end-sub of cap A g cap I equals open bracket cap A g raised to the positive power close bracket open bracket cap I raised to the negative power close bracket