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The solubility product constants of Ag2CrO4, AgCl, AgBr and AgI are 1.1 × 10⁻¹², 1.8 × 10⁻¹⁰, 5.0 × 10⁻¹³ and 8.3 × 10⁻¹⁷, respectively. If AgNO3 solution is added to a mixture containing equal amounts of NaCl, NaBr, NaI and Na2CrO4, which silver salt will begin to precipitate at the highest Ag+ concentration, i.e., the last one to form?
- AgCl
- AgBr
- Ag2CrO4
- AgI
Correct answer: Ag2CrO4
Solution
For equal anion concentrations the [Ag+] needed to start precipitation is highest for Ag2CrO4 (~1e-6) versus AgCl 1.8e-10, AgBr 5e-13, AgI 8.3e-17. AgI precipitates first (lowest [Ag+]); Ag2CrO4 precipitates last.
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