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Posted by on Thursday, January 5, 2012 at 2:43pm.

If .100 M NaCl (aq) is added slowly to a beaker containing both .120 M AgNO3 (aq) and .150 M Pb(NO3)2 (aq) at 25C which will precipitate first, AgCl(s)PbCl2(s)?

  • AP Chemistry - , Thursday, January 5, 2012 at 6:08pm

    AgCl ==> Ag^+ + Cl^-
    Ksp = (Ag^+)(Cl^-)
    (Cl^-) = Ksp/(Ag^+).
    YOu know Ksp and Ag^+, solve for Cl^-

    PbCl2 ==> Pb^2+ + 2Cl^-
    Ksp = (Pb^2+)(Cl^-)^2
    (Cl^-) = sqrt(Ksp/(Pb^2+)
    You know Ksp and (Pb^2+), solve for Cl^-.

    Now consider that you are dripping the NaCl into the beaker (slowly) containing BOTH salts, the first ppt will be the one that exceeds the Ksp first.

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