Cu(OH)_2 (s) has a K_sp of 2.2 times 10^-20. Write a reaction representing the d

Question

Cu(OH)_2 (s) has a K_sp of 2.2 times 10^-20. Write a reaction representing the dissolution of Cu(OH)_2 (s). Write the K_sp equilibrium constant expression. Will a saturated aqueous solution of Cu(OH)_2 (s) be acidic, neutral, or basic? Calculate [Cu^2+] in a saturated aqueous solution of Cu(OH)_2 (s) prepared in pure water. Calculate [Cu^2+] in a saturated aqueous solution of Cu(OH)_2 (s) prepared in a solution buffered to pH = 9.00. You may assume that the buffer maintains this pH even after dissolution of small amounts of the solid.

Explanation / Answer

A)
Cu(OH)2 <---> Cu2+ + 2OH-

B)
Ksp = [Cu2+] [OH-]^2

C)
It will be basic since Cu(OH)2 gives OH-

D)
Cu(OH)2 <---> Cu2+ + 2OH-
s 2s

Ksp = [Cu2+] [OH-]^2
2.2*10^-20 = s * (2s)^2
4*s^3 = 2.2*10^-20
s = 1.765*10^-7 M

[Cu2+] = s = 1.765*10^-7 M

I am allowed to answer only 4 parts at a time

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