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   [Cd(H2O)6](2+) + Br(-) = [Cd(H2O)5Br](+) + H2O  K1
   [Cd(H2O)5Br](+) + Br(-) = [Cd(H2O)4Br2]+ H2O     K2
   [Cd(H2O)4Br2] + Br(-) = [Cd(H2O)3Br3](-) + H2O   K3
   [Cd(H2O)3Br3](-) + Br(-) = [CdBr4](2-) + 3H2O      K4
   K1 > K2 > K3   ºÜÕý³£
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