3pH=448m,y=0.95 H2Y21=c5my=0.02×0.95=0.02 推论:Na2H2Y2H2O→Na++H2Y 溶液pH=44 (4)HY:EDIA溶解度小0.02g/100mH2O 22℃ EDn~7×104moL Na2H2Y溶解度大111g/100mH2O 22℃ EDTA 0.3mol/L 配成0.01~0.02mo的水溶液pH=44 上页[下一页[返上一页 下一页 返回10 3)pH=4.4 δH2Y=0.95 [H2Y2- ]=c δH2Y=0.02×0.95=0.02 推论： Na2H2Y·2H2O → Na+ +H2Y 溶液pH=4.4 (4)H4Y: EDTA溶解度小0.02g/100mlH2O 22℃ cEDTA=7×10-4mol/L Na2H2Y溶解度大 11.1g/100mlH2O 22℃ cEDTA=0.3mol/L 配成0.01~~0.02mol/L的水溶液 pH=4.4