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Ksp equation

  1. Jun 30, 2009 #1
    CaF2⇔Ca+2F.
    Many places state that Ksp=[Ca][2F]^2; Ksp=[x]*[2x]^2.
    I thought the coefficient go into Ksp equation as an exponent. So, Ksp=[Ca][F]^2.

    Can anyone explain which is correct, or why [2F]^2 (if that's the correct one)?
     
  2. jcsd
  3. Jun 30, 2009 #2

    Borek

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    Staff: Mentor

    That's wrong. Are you sure you are not misreading:

    which is correct - assuming x is molar solubility of CaF2.

    That's correct.
     
  4. Jun 30, 2009 #3
    Why do we get Ksp=[x]*[2x]^2?
    (Ksp=[Ca][2F]^2 is from this.. misread wrong)
     
  5. Jun 30, 2009 #4

    Borek

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    Staff: Mentor

    Simple stoichiometry. If x moles of CaF2 are dissolved - how many moles of Ca2+? How many moles of F-?
     
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