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Calculating free energy from Ksp

  1. Feb 18, 2009 #1
    Okay so I'm confused. In my book it says that ksp for Ca(OH)2 = 6.5E-6 and [tex]\Delta G=-898.5[/tex] yet when I use the equation [tex]\Delta G=-RTln(Ksp)[/tex] the value I get is 29.59KJ/mol. I used R=8.314 and T=298K. What's up with that? Thanks.
  2. jcsd
  3. Feb 20, 2009 #2
    Hint: Consider the implications of the solubility constant versus the
    \Delta G\
    of formation (which is the value you have given), specifically the reactions involved.
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