Calculate the concentration (in M) of Tl^+ when TlI just begins to precipitate from a solution that is 0.0315 M in I^−. (Ksp = 5.54 ✕ 10^−8)
Do I just set up an ICE table for this? So it would be 5.54X10^-8 = (.0315+x)x?
2 answers
That is almost completely right and I'm being picky. You will get the correct answer your way BUT the problem tells you that Tl^+ is x. The problem tells you that the concn of I^- is 0.0315 M; i.e., THAT IS THE CONCN OF I^- so you plug in 0.0315 for I^- and not 0.0315 + x.
Perfect! Thank you for your help! :)