I need help with the last part of a four part question - Part D

Question

In qualitative analysis, Ag , Hg2(2 ) and Pb(2 ) are separated from other cations by the addition of HCl.

Part A

Calculate the concentration of Cl- required to just begin the precipitation of AgCl in a solution having metal-ion concentrations of 0.022 M.

ANSWER = 8.2x10^(-9)

Part B

Calculate the concentration of Cl- required to just begin the precipitation of Hg2Cl2 in a solution having metal-ion concentrations of 0.022 M.

ANSWER = 8.0X10^-9

Part C

Calculate the concentration of Cl- required to just begin the precipitation of PbCl2 in a solution having metal-ion concentrations of 0.022 M.

ANSWER = 2.3X10^(-2)

Part D

What fraction of the Pb(2 ) remains in the solution when the Ag just begins to precipitate?

ANSWER = ??????

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