多博字化学与分子科学学院 匚口 LLEGE口 F CHEMISTRY月 ND MOLED凵LRR5匚 IENC ES WUHAN UNIVERSITY EDTA HY2+=H++H Y* Kal taph n0190 [H*]H4Y] HY+=H++hY K =10-1.0 [HsY HY =H++Y TH]H3Y 10 HAY HY =H++hY TH[H2Y 10 2.67 [H3Y] HY2-=H++HY H#HY 5 =10-6.16 [HeY HY3=H++Y4 K=HTY 10-10.26 THY 溪字 Wuhan UniversitEDTA 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]