b.水的质子自递反应 H2o+H2OH3o+OH(25°C K=a(H+)a(OH)=1.0×104 共轭酸碱对(HAA)的K与K的关系为 KK=a(H).(A)a(HA). a(OH) K ala a(ar- pKa+pkb= pKw=14.005 H2O + H2O H3O+ + OH- (25°C) 14 00 p p p . K K K a b w + = = 14 w (H ) (OH ) 1.0 10 + - - K a a =  =  + a b w (H ) (A) (HA) (OH ) (HA) (A) a a a a K K K a a −   =  = 共轭酸碱对(HA-A)的Ka与Kb的关系为 b. 水的质子自递反应