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Àý£º Cu(OH)2 = Cu(2+) + 2OH(-)    ¿ÉÄæ  Ksp
       Cu(2+) + 4NH3 = [Cu(NH3)4](2+)  ¿ÉÄæ Kf
       Cu(OH)2 + 4NH3 = [Cu(NH3)4](2+) + 2OH(-)  K
K = [ [Cu(NH3)4](2+) ] * [OH-]^2 * [Cu2+] /{[NH3]^4*[Cu2+]
   = Kf * Ksp
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