Constant of Solubility

  • Thread starter Qube
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  • #1
Qube
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Homework Statement



A saturated solution of iron(II) hydroxide has a molar solubility of 3.65 x 10^-6 M. Calculate the Ksp for Fe(OH)2.

Homework Equations



Ksp = [A]^a^b

The Attempt at a Solution



Fe(OH)2 --> Fe^2+ + 2OH-

Ksp = [3.65 x 10^-6 M] * (2*[3.65 x 10^-6 M])^2

This, however, doesn't yield an answer. The professor's answer is equivalent to

[3.65 x 10^-6 M] * ([3.65 x 10^-6 M])^2

I'm assuming this is an error on his part because the concentration of hydroxide ions should be twice the concentration of iron ions, not the same.
 

Answers and Replies

  • #2
Borek
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Your approach is the correct one.
 

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