posted by Audrey .
If solid AgNO3 is slowly added to a solution that is .05 M in NaI and .12 M in NaCl, what is the concentration of I- when AgCl just begins the precipitate?
Ksp for AgCl= 1.8 x 10^-10
Ksp for AgI= 1.5 x 10^-16
Set up a ratio between Ksp AgCl/Ksp AgI and their respective expressions, and go from there. Post your work if you get stuck.