The key should explain why you choose one ion over another using Ksp expressions. For example: “To precipitate AgI first, we calculate [Ag⁺] needed = Ksp(AgI)/[I⁻]. Compare to [Ag⁺] needed for AgCl. The lower [Ag⁺] wins.”
Monday morning arrived. The students filed in, looking haggard from the weekend assignment.
Suppose [I⁻] = (1.0 \times 10^-10 M) and [Cl⁻] = 0.10 M. Then: fractional precipitation pogil answer key best
Most POGIL exercises guide you through a specific scenario, such as a solution containing equal concentrations of Chloride ( Cl−Cl raised to the negative power ) and Chromate ( CrO42−CrO sub 4 raised to the 2 minus power ), to which Silver Nitrate ( AgNO3AgNO sub 3 ) is slowly added.
% remaining=(4.7×10-8 M0.10 M)×100%=0.000047%% remaining equals open paren the fraction with numerator 4.7 cross 10 to the negative 8 power M and denominator 0.10 M end-fraction close paren cross 100 % equals 0.000047 % Less than The key should explain why you choose one
If you are dealing with a salt like PbCl2cap P b cap C l sub 2 , remember that the Kspcap K sub s p end-sub expression is
This is the practical process of adding a counter-ion to a mixture to intentionally isolate one specific ion while leaving the others dissolved in the liquid phase. Step-by-Step Fractional Precipitation Mechanics The lower [Ag⁺] wins
Ksp=[M+][X−]cap K sub s p end-sub equals open bracket cap M raised to the positive power close bracket open bracket cap X raised to the negative power close bracket Rearrange the equation to isolate the added titrant ion ( M+cap M raised to the positive power
To successfully navigate a fractional precipitation POGIL activity, you must first master three foundational chemical concepts. These ideas dictate which ion leaves the solution first and how clean the separation will be. Solubility Product Constant ( Kspcap K sub s p end-sub