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.
If you have two cations, you calculate the required concentration of the added anion for both. The cation that requires the smaller concentration of the added anion will precipitate first. For example, if adding cap I raised to the negative power to a mix of cap C u raised to the positive power cap P b raised to the 2 plus power cap C u cap I starts precipitating at cap P b cap I sub 2 starts precipitating at cap C u cap I fractional precipitation pogil answer key
ZnCO3(s)⇌Zn2+(aq)+CO32−(aq)cap Z n cap C cap O sub 3 open paren s close paren is in equilibrium with cap Z n 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 Always calculate the required precipitant concentration
substance and its initial concentration to find the required concentration of the precipitating anion (e.g., Plug that anion concentration into the cap K sub s p end-sub expression for the If you have two cations, you calculate the
Keep practicing, trust the equilibrium, and use guided inquiry to build lasting chemical intuition.