Problem: Copper(II) hydroxide, Cu(OH)2, has Ksp = 2.2 x 10 -20. For the reaction below, Keq = 4.0 x 10-7. What is Kf for Cu(NH3)42+?Cu(OH)2(s) + 4 NH3(aq) ⇋ Cu(NH3)42+(aq) + 2 OH -(aq)

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We’re being asked to determine the formation constant of Cu(NH3)42+


We’re given the following reaction and equilibrium constant:

Cu(OH)2(s) + 4 NH3(aq)  Cu(NH3)42+(aq) + 2 OH(aq); Keq = 4.0 × 10–7


The Keq expression for this reaction is:


Keq=productsreactants=[Cu(NH3)42+][OH-]2[NH3]4


Note that solids and liquids are not included in the equilibrium expression and that each concentration is raised by the stoichiometric coefficient: [NH3] is raised to 4, [Cu(NH3)42+] is raised to 1, and [OH] is raised to 2.


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Problem Details

Copper(II) hydroxide, Cu(OH)2, has Ksp = 2.2 x 10 -20. For the reaction below, Keq = 4.0 x 10-7. What is Kf for Cu(NH3)42+?

Cu(OH)2(s) + 4 NH3(aq) ⇋ Cu(NH3)42+(aq) + 2 OH -(aq)

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