Posted by Maggy on Monday, October 29, 2012 at 12:25pm.
Look up Ksp for AgCl, AgBr and AgI.
The salt with the smallest Ksp will ppt first.(this comparison is true only when the salts have the same ratio. In this case all are 1:1).
The following shows you how to calculate Ag^+ at the time EACH ppts. However, AgCl will not ppt first and that's the one you are calculate. AgI ppts first.
......AgCl(s) ==> Ag^+(aq) + Cl^-(aq)
I.......solid......0..........0
C.......solid......x..........x
E.......solid......x..........x
Ksp = whatever = (Ag^+)(Col^-)
Ksp = (x)(x)
Solve for x = (Ag^+).
i got 4.46*10^-4??
No, that isn't right; however, I may have led you down the wrong path. I see at the top that the solution is 0.1M in I^- so
AgI==> Ag^+ + I^-
........x.....x
Ksp = (Ag^+)(I^-)
Ag^+ is x from AgI.
I^= 0.1M from the problem.
8.51E-17 = (0.1)(x)
Solve for x.
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