必岛他 College of Chemistry Chemical Engineering Analytical chemistry 1溶解度 溶解度小:0.02g/100 mL water22℃ Na2Y·2H2O,溶解度:111g/100 mL water,22℃ c=0.3 mol.-, pH=4.4o 2酸性 H HOOCH2C N一CH2CH2—N ∠CH2COO OOCH,C H CH2COOH HY2 Chap vI Compler Titration 2013-2014学年
Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry ChapⅥ Complex Titration Complex Titration Complex Titration Complex Titration 2013-2014 2013-2014 2013-2014 2013-2014学年 Na2H2Y·2H2O, 溶解度：11.1 g / 100 11.1 g / 100 11.1 g / 100 11.1 g / 100 mL water, 22 water, 22 water, 22 water, 22℃ c = 0.3 mol = 0.3 mol = 0.3 mol = 0.3 mol·L-1 , pH = 4.4 , pH = 4.4 , pH = 4.4 , pH = 4.4。 1 溶解度 2 酸性 HOOCH2C N H CH2COO - CH2COOH N H CH2 CH2 -OOCH2C + + H6Y2+ 溶解度小: 0.02 g/ 100 : 0.02 g/ 100 : 0.02 g/ 100 : 0.02 g/ 100 mL water 22 water 22 water 22 water 22 ℃
必岛他 College of Chemistry Chemical Engineering Analytical chemistry [HHSY H6Y2+= H++HsY K [H。Y2+] HY+= H++hY [HSY HY E H++HY K [HIH2Y 2.0 [HAY [H+][H2Y H3Y·=H++H2Y2 [HaY HY2-= H++HY3-K [H+][HY3 10 6.16 [H,Y H+][Y HY3= H++Y4 K 10 10.26 THY Chap vI Compler Titration 2013-2014学年
Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry ChapⅥ Complex Titration Complex Titration Complex Titration Complex Titration 2013-2014 2013-2014 2013-2014 2013-2014学年 HY3- ＝ H+ + Y4- H6Y2＋ ＝ H+ + H5Y+ H5Y＋ ＝ H+ + H4Y H4Y ＝ H+ + H3YH3Y- ＝ H+ + H2Y2- H2Y2- ＝ H+ + HY3- 5 0 .9 1 2 6 [ H ][ H Y ] 1 0 [ H Y ] K a + + − + = = 4 1 .6 2 5 [ H ] [ H Y ] 1 0 [ H Y ] K a + − + = = - 3 2 .0 3 4 [ H ] [ H Y ] 1 0 [ H Y ] K a + − = = 2 - 2 2 .6 7 4 3 [ H ] [ H Y ] 1 0 [ H Y ] K a + − − = = 3 - 6 .1 6 5 2 2 [ H ] [ H Y ] 1 0 [ H Y ] K a + − − = = 4 - 1 0 .2 6 6 3 [ H ] [ Y ] 1 0 [ H Y ] K a + − − = =
必岛他 College of Chemistry Chemical Engineering Analytical chemistry HY I 0.8 0.6 0.4 HY 0.2 10 14 10 6.置6 2.67 1026 EDTA的分布 Chap vI Compler Titration 2013-2014学年
Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry ChapⅥ Complex Titration Complex Titration Complex Titration Complex Titration 2013-2014 2013-2014 2013-2014 2013-2014学年 EDTA的分布 1.0 2.67 6.16 10.26
必岛他 College of Chemistry Chemical Engineering Analytical chemistry EDTA的质子化常数 4-+H+=hr3 hY 3 [H+][Y 2 HY3. +H+=HY2- K2 [HTIHY H,Y2-+H+=H3Y K H [H3Y] [H+][H2Y HY-+H+=HY [H4Y] HEy K HY +H+= hY [H+]H4Y] HY++H+=hY2+ K [HAY HHSY Chap vI Compler Titration 2013-2014学年
Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry ChapⅥ Complex Titration Complex Titration Complex Titration Complex Titration 2013-2014 2013-2014 2013-2014 2013-2014学年 EDTA的质子化常数 Y4- + H+ ＝HY3- HY3- + H+ ＝H2Y2- 3 1 4 [ H Y ] [ H ] [ Y ] H K − + − = 6 1 K a = 2 2 2 3 [ H Y ] [ H ] [ H Y ] H K − + − = 5 1 K a = H5Y+ + H + ＝H6Y2+ H2Y2- + H+ ＝ H3YH3Y- + H+ ＝H4Y H4Y + H+ ＝ H5Y+ 3 3 2 2 [ H Y ] [ H ] [ H Y ] H K − + − = 4 1 K a = 4 4 3 [ H Y ] [ H ] [ H Y ] H K + − = 3 1 K a = 5 5 4 [ H Y ] [ H ] [ H Y ] H K + + = 2 1 K a = 2 6 6 5 [ H Y ] [ H ] [ H Y ] H K + + + = 1 1 K a =
必岛他 College of Chemistry Chemical Engincering Analytical chemistry 3EDTA的配位性(613EDTA的螯合物) FOgCH2C NCH2 CHaNy CHacO0' H HOOCH2C CH, COOH H2C CH2 Ca CH2 O Chap vI Compler Titration 2013-2014学年
Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry ChapⅥ Complex Titration Complex Titration Complex Titration Complex Titration 2013-2014 2013-2014 2013-2014 2013-2014学年 3 EDTA 3 EDTA 3 EDTA 3 EDTA的配位性（6.1.3 EDTA 6.1.3 EDTA 6.1.3 EDTA 6.1.3 EDTA的螯合物） HOOCH2C N H CH2COO - CH2COOH N H CH2 CH2 -OOCH2C + + O Ca O O N O N C O H2C H2 C CH2 CH2 C C CH2 C H2C O O O N .. O C O