Ksp equation

  • Thread starter staka
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  • #1
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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)?
 

Answers and Replies

  • #2
Borek
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Many places state that Ksp=[Ca][2F]^2

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

Ksp=[x]*[2x]^2.

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

Ksp=[Ca][F]^2.

That's correct.
 
  • #3
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Why do we get Ksp=[x]*[2x]^2?
(Ksp=[Ca][2F]^2 is from this.. misread wrong)
 
  • #4
Borek
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Simple stoichiometry. If x moles of CaF2 are dissolved - how many moles of Ca2+? How many moles of F-?
 

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