18.1 Mastery #3 Q2
Solubility to Ksp
A student measures the molar solubility of iron(II)
hydroxide in a water solution to be
1.29×10-5 M.
Based on her data, the solubility product constant for this
compound is ___.
At equilibrium:
Fe(OH)2 <----> Fe2+ + 2 OH-
s 2s
Ksp = [Fe2+][OH-]^2
Ksp = (s)*(2s)^2
Ksp = 4(s)^3
Ksp = 4(1.29*10^-5)^3
Ksp = 8.587*10^-15
Answer: 8.59*10^-15
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