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A sample of 0.02 moles of NaCl is dissolved in a 1.00 liter solution of
water. Some solid AgCl and some solid AgBr are added and the system is
allowed to equilibrate. At equilibrium, not all of the two solids have dissolved.  So what are the concentrations of the ions of sodium, chlorine, silver, and bromine in the solution?

Can somebody point me in the right direction?    Thank you.