This guide is intended for students to check their work and deepen understanding, not to bypass the learning process. Use this as a study aid after attempting the POGIL activity on your own.
Pay close attention to the ion ratios. If you are comparing AgClcap A g cap C l (1:1 ratio) to Ag2CrO4cap A g sub 2 cap C r cap O sub 4 (2:1 ratio), you cannot simply look at the Kspcap K sub s p end-sub
The reagent added is almost always the limiting factor, which is why we solve for its concentration first. fractional precipitation pogil answer key
By understanding these principles, you will be able to complete the Fractional Precipitation POGIL activity accurately.
A common "critical thinking" question in these POGILs asks how much of the first ion remains when the second begins to precipitate. required for the precipitate to form. back into the cap K sub s p end-sub expression of the precipitate. Solve for the concentration of the first cation. This guide is intended for students to check
Cu2+(aq)+CO32−(aq)→CuCO3(s)cap C u raised to the 2 plus power open paren a q close paren plus cap C cap O sub 3 raised to the 2 minus power open paren a q close paren right arrow cap C u cap C cap O sub 3 open paren s close paren Model 2 & 3: Comparing Qspcap Q sub s p end-sub and Kspcap K sub s p end-sub
To find when a specific ion will start to precipitate, you set . If you are adding a carbonate ( cap C cap O sub 3 raised to the 2 minus power ) to a solution of cap Z n raised to the 2 plus power , you use the formula: If you are comparing AgClcap A g cap
Ksp = [Ag⁺][Cl⁻] = 1.8 × 10⁻¹⁰ [Cl⁻] = (1.8×10⁻¹⁰) / (0.01) = 1.8 × 10⁻⁸ M
A common misconception is that the compound with the smallest Kspcap K sub s p end-sub
Before diving into the POGIL questions, it is crucial to understand the foundational principles of solubility equilibria. Solubility Product Constant ( Kspcap K sub s p end-sub
By carefully controlling the concentration of the common ion, you can remove one metal ion almost completely while the other remains dissolved. 2. Common POGIL Model Problems
