Fractional Precipitation Pogil Answer Key Best [updated]

A common "critical thinking" question in POGILs asks how much of the first ion remains in the solution when the second ion just begins to precipitate. To find this, take the required for the second ion ( from the example above) and plug it back into the Kspcap K sub s p end-sub expression for the first ion:

Lime (Ca(OH)₂) is added to precipitate Mg²⁺ as Mg(OH)₂ before Ca²⁺ as CaCO₃. Engineers must control pH to achieve fractional precipitation. fractional precipitation pogil answer key best