Answer-key style checklist for each POGIL question
) to selectively remove one cation from a mixture. Below is a guide to the standard models and key answers found in this activity. Model 1: A Precipitation Experiment fractional precipitation pogil answer key
Always calculate the required precipitant concentration . For (Ag_2S) (very small (K_sp)) vs. (CuS), the sulfide ion needed might be different due to stoichiometry. Answer-key style checklist for each POGIL question )
As the precipitating agent is added drop-wise, you calculate the reaction quotient ( Qspcap Q sub s p end-sub ) for both potential solids to see which reaches its Kspcap K sub s p end-sub first. The substance with the lower Kspcap K sub s p end-sub For (Ag_2S) (very small (K_sp)) vs
Step 3 — Order of precipitation:
) at the lowest concentration of the added reagent precipitates first.