(2.b) [Pb+2] = 1.6 x 10-3 M & [I-] = 3.2 x 10-3
If the concentration of I- is 2x then (2x)2 = 4x2
Remember that when the ions come only from the solid dissolving, the concentrations are related . Thus [I-] = 2[Pb+2] = 2x
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