): The equilibrium constant for a solid substance dissolving in an aqueous solution. Used to determine if a precipitate will form. , a precipitate forms. , the solution remains unsaturated.
), one will typically crash out of the solution before the other. Core Principles Solubility Product ( Kspcap K sub s p end-sub fractional precipitation pogil answer key 2021
To find the answer key's logic for "at what concentration does precipitation begin," use the formula: ): The equilibrium constant for a solid substance
Fractional precipitation is a laboratory technique used to separate two or more ions in a solution by adding a reagent that forms a precipitate with each ion. Because different salts have different solubility product constants ( Kspcap K sub s p end-sub , the solution remains unsaturated
The substance with the lower required concentration of the precipitating agent will fall out of solution first. Common Pitfall: Don't just look at the Kspcap K sub s p end-sub
Find the concentration of the added ion needed to start the second precipitation. Step B: Plug that concentration back into the Kspcap K sub s p end-sub