(A) AgNO₃(aq) is slowly added to a solution with [CI^-] = 0.115 M and [Br^-] = 0.264 M. What percent of the Br^- remains unprecipitated at the point at which AgCl(s) begins to precipitate?

(B) A solution has [Ba²⁺] = [Sr²⁺] = 0.10 M. Use data from Appendix D to choose the best precipitating agent to separate these two ions. What is the concentration of the first ion to precipitate when the second ion begins to precipitate?

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AgCl: Ksp = 1.8 × 10-10 AgBr: Ksp = 5.0 × 10-13