必岛他 College of Chemistry Chemical Engineering Analytical Chemistry分析化学 总结 指示剂 K, CrO4 FeNH4(SO4小2吸附指示剂 滴定剂 Ag+ SCN cH或Ag 滴定反应Ag+Ch= AgCI SCN+Ag= agSCN Ag+Cl=AgC1 Precipitation reaction Complex reaction 指示原理2Ag+CrO4 Fe++ScN- adsorption Ag, CrO4 =FeSCN2 pH条件pH=6510503mM的HNO3pK~10 测定对象Ag,Ch,Br, Ag, Cl, Br,I,, Cl, Br. SCN等 SCN,Ag等 Chapel Precipitation Titration 20112012学年Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry Analytical Chemistry 分析化学 ChapⅧ Precipitation Titration Precipitation Titration Precipitation Titration Precipitation Titration 2011-2012 2011-2012 2011-2012 2011-2012学年 pKa pH条件 pH＝6.5~10.5 6.5~10.5 6.5~10.5 6.5~10.5 0.3mol/L 0.3mol/L 0.3mol/L 0.3mol/L的HNO3 ~ 10 Cl -, Br-, SCN- ,Ag+等 Ag+ , Cl -, Br-, I-, SCN-等 Ag+ , Cl -, Br- 测定对象 , adsorption adsorption adsorption adsorption Complex reaction Complex reaction Complex reaction Complex reaction Fe3++SCN- =FeSCN2+ Precipitation reaction Precipitation reaction Precipitation reaction Precipitation reaction 2Ag++CrO4 - =Ag2CrO4 指示原理 Ag++Cl SCN -=AgCl -+Ag 滴定反应 Ag++Cl -=AgCl +=AgSCN Cl -或Ag 滴定剂 Ag＋ SCN- + 指示剂 K2CrO4 Fe NH4 (SO4) 2 吸附指示剂 总 结