Lead iodide, PbI2, has a Ksp in water of 7.1e-9 M3 at room temperature.

Calculate the solubility of PbI2 in water. Express your answer in grams per liter.

What is the solubility of PbI2 in 0.1 M NaI (aq)? Express your answer in grams per liter.

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  1. This is simple Stoichiometry problem

    Write down PbI2 -> Pb2+ + 2I-


    Ksp = [Pb2+][I-]^2

    From the stoich you can derive that

    Ksp = Cs(2Cs)^2 = 4Cs^3

    Hence Cs = (Ksp/4) ^ 1/3

    Then multiply the Molar Weight to get grams / Liter unit that you like

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  2. The second problem is common ion effect

    First see is the added ion concentration more than or less than your Cs.

    0.1 seems to be >>>> than Cs so common ion will happen

    Ksp = Cs'(0.1)^2 = 0.01Cs'


    Cs' = Ksp/0.01

    Then just multiply by Molar weight again to convert to g/L units .

    Note use the Molar Weight of PbI2 !!!!

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