必岛他 College of Chemistry Chemical Engineering Analytical Chemistry分析化学 例2:CaC2O4在pH=40的HC溶液中的溶解度? 解: CaC204s)= Caz++ C2042 HLC2O4 H].[H 2.56 C2O C2O4^(H) +∑B[Hy=1+ Ca=5, Co4=5 √20×10°×2.56=72×105moL CO haplY Gravimet 2013-2014Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry 分析化学 ChapⅨ Gravimetry Gravimetry Gravimetry Gravimetry 2013-2014 2013-2014 2013-2014 2013-2014学年 例2：CaC2O4在pH = 4.0 pH = 4.0 pH = 4.0 pH = 4.0 的HCl溶液中的溶解度？ 溶液中的溶解度？ 溶液中的溶解度？ 溶液中的溶解度？ CaC2O4(s) � Ca2+ + C2O4 解： 2- H+ H2C2O4 2 2 4 [Ca] , [C O '] s s − = = 2- 2- 2 4 2 4 2 C O C O (H) 2 2 1 [H ] [H ] α α 1 [H ] 1 2.56 H i i K K K a a a β + + + = = + = + + = ∑ ' sp s K = 2- 2 4 9 5 C O K spα 2.0 10 2.56 7.2 10 mol/L − − = = × × = × 2- 2 4 sp sp C O K K ' = α