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Chemistry

One way to remove lead ion from water is to add a source of iodide ion so that lead iodide will precipitate out of solution:

Pb2+(aq) + 2I−(aq) → PbI2(s)

What volume of a 1.0 M KI solution must be added to 320.0 mL of a solution that is 0.22 M in Pb2+ ion to precipitate all the lead ion?

What mass of PbI2 should precipitate?

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Jane

  1. .320L * 0.22M = 0.070 moles of Pb
    So, you will need 0.70 moles of I
    x L * 1.0 M = 0.70 moles
    Looks like 700 mL needed

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    oobleck

  2. Lead(II) iodide is PbI2. If you have 0.070 mols Pb wouldn't that need twice that or 0.140 mols I^-?
    grams PbI2 pptd will be mols PbI2 x molar mass PbI2 = ?

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    DrBob222

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