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例如：三元酸H3A A3-+H0一HA2+OH Ko=Kw/Ko HA2-+H20→H2A+OH Ko =Kw/Kos H2A +H2O+H3A+OH Ko Kw /Ka Ka1·Kb3=Ka2·Kb2=Ka3Kb1=Kw例如：三元酸H3A A3- +H2O HA2- +OHHA2- + H2O H2A- +OHH2A- + H2O H3A +OH- 1 3 / Kb = KW K 2 2 / Kb = KW K 3 1 / Kb = KW K Ka Kb Ka Kb = Ka Kb = Kw = 1 3 2 2 3 1