课程名称︰分析化学乙 上 课程性质︰生技系必修 课程教师︰刘春樱 开课学院：理学院 开课系所︰化学系 考试日期（年月日）︰jan.16.2009 考试时限（分钟）：120min 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1.Explain the following terms:(21points) (a)isoionic point (b)EDTA displacement titration (c)salt bridge (d)formal potential (e)liquid junction (f)leveling effect (g)conditional formation 2.How to prepare a carbon free NaOH solution, and how to standardize a standardize a solution of NaOH?(4 points) 3.The base B is too weak to titrate in aqueous solution. (a)Which solvent, pyridine or acetic acid, would be more suitable for the titration of B with HClO4? why? (b)which solvent,pyridine or acetic acid, would be more suitable for the titration of a very weak acid with tetrabutylammonium hydroxide? why? (6 points)_ 4.Illustrate the standard hydrogen electrode.(4 points) 5.Give a diagram to show the electrolytic cell and galvanic cell including the following terms(a)sign of electrode, postive or negative? (b)cathode or anode?(c)the cell potential >0 or <0? (6 points) 6.A piece of copper was immersed in a 0.05M silver nitrate solution. Please show the equilibrium concentration of all the species in this system? (8 points) (Ag+ + e- → Ag Eo=0.799V) (Cu2+ + 2e- → Cu Eo=0.337V) 7. Calculate the solubility product of CuX2 from following cell. The cell potential is 0.010V. Cu/CuX2(standar), NaX(0.010M)//SHE (8 points) 8.At what OH- concentration is the solubility of Zn(OH)2 a minimum? (KSP of Zn(OH)2 is 1.2x10^-17 Kf of Zn(OH)4 is 0.13) (10 points) 9.Deferrioxamin B can be used in chelation therapy for Thalassemia.Give the reason? (5 points) 10.Pyrocatechol violet is to be used as a metal ion indicator in an EDTA titration. The procedure is as follow: (9 points) (1)Add a known excess of EDTA to the unknown metal ion. (2)Adjust the pH with a suitable buffer (3)back-titration the excess chelate with standar Al+3 Discribe the reason for all above mentioned process.From the following available buffer, sellect the best buffer, and then state what color change will be observe at the end point, explain your answer. (4)(a)pH6-7 (b)pH7-8 (c)pH8-9 (d)pH9-10 11.How are the following factor factors affecting the shape of the titration curve in the complexometric titration.(a)type of the ligand (b)type of metal ion (c)amount of auxiliary reagent (d)concentration of analyte and titrant (e)pH (10 points) 12.A 50.0ml solution containing Ni+2 & Zn+2 was treated with 25ml of 0.0452M EDTA to bind all metal. The excess unreacted EDTA required 12.4ml of 0.0123M Mg+2 for complete reaction. An excess of the reagent 2,3-dimercapto-1-propanol was then added to displacement the EDTA from zinc. Another 29.2ml of Mg+2 were required for reaction with the liberated EDTA. Calculating the molarity of Ni+2 and Zn+2 in the original solution. (12 points) 13.How to find the end point detected with a pH electrode by the following methods?(a)using derivatives to find the end point (b)using a Gran plot to find the end point. (12 points) --

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