式溪*享化学与分子科学学院 COLLESE OF CHEMIS TRY AND MOLECULRR SCIENCES WUHRN UNIVERSITY EDTA HY2+=H++H5Y [H][H5灯 H6Y门 =10-0.90 [H*][HY] HY+=H++H.Y Ka2 =101.60 [HsY门 HY =H++H;Y Ka3- [H][H3☒ =10-2.00 [H4Y门 H3Y -H++H2 Y2- [H*][H2Y] =10-2.67 [H3门 H,Y2-=H++HY3- [H][HY☑ =10-6.16 [H2Y门 HY3.=H++Y4 [H][M =10-10.26 [HY] 或溪*字 Wuhan University EDTA H6Y2＋ ＝H+ + H5Y+ H5Y＋ ＝H+ + H4Y H4Y ＝H+ + H3Y￾H3Y- ＝H+ + H2Y2- H2Y2- ＝H+ + HY3- HY3- ＝H+ + Y4- Ka1= = 10-0.90 [H+ ][H5Y] [H6Y] Ka2= = 10-1.60 [H+ ][H4Y] [H5Y] Ka3= = 10-2.00 [H+ ][H3Y] [H4Y] Ka6= = 10-10.26 [H+ ][Y] [HY] Ka5= = 10-6.16 [H+ ][HY] [H2Y] Ka4= = 10-2.67 [H+ ][H2Y] [H3Y]