| Ion pair | (K_sp) values | Which precipitates first? | [anion] to start 1st ppt | [anion] to start 2nd ppt | % of 1st ion left when 2nd starts | |----------|----------------|------------------------|------------------------|------------------------|----------------------------------| | AgCl ((K_sp=1.8\times10^-10)), AgI ((8.3\times10^-17)) | ... | ... | ... | ... | ... | | CaF₂ ((3.9\times10^-11)), SrF₂ ((2.9\times10^-9)) | ... | ... | ... | ... | ... |
(solubility product constant) will generally precipitate first, as its saturation point is reached at a lower concentration of the added reagent. Condition for Precipitation ( cap K sub s p end-sub : A precipitate begins to form when the reaction quotient ( ) exceeds the solubility product constant ( cap K sub s p end-sub Separation Efficiency fractional precipitation pogil answer key
If you are working through a POGIL and find yourself stuck, keep these tips in mind: Always write out the balanced dissolution equation first. | Ion pair | (K_sp) values | Which precipitates first
"The range of ([Cl^-]) for successful separation is from (1.8\times10^-8 M) (start AgCl) to (0.041 M) (start PbCl_2)." | | CaF₂ ((3
You can predict which ion will "fall out" of solution first by comparing Kspcap K sub s p end-sub values. The salt that reaches its saturation point (where