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）︰NOV.28,2008 考试时限（分钟）：100min 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 :(共115分) 1.Explain the following terms:(18分) a.internal standard b.coagulation c.standard addition d.Fajans method e.Buffer capacity f.homogeneous precipitation 2.write the charge balance for a solution containing H20, H+, ClO4-, Fe(CN)6^-3,CN-,Fe+3,Mg+2,CH3OH,HCN,NH3,NH4+ (3分) 3.Describe how you might prepare 500ml of pH5.0 , 0.1M buffer solution from CH3COONa-HCl (note:HCl:sp=1.18,w/w=37,MW of CH3COONa=82)(8分) 4.Find the pH=-log[H+] of 0.725M sodium chloride solution , if Ko(activity constant) of water is 1.008X10^-14 at 25度C.(10分) 5.Give equations to state Volhard method for the determination of chloride ion.Why dose a Volhard determination of iodide ion require fewer steps than a Volhard determination of chloride ion?(8分) 6.Derive equations that define α0,α1,α2,α3 for the acid H3AsO4 (8分) 7.Give the shape of the spectrophotometric titration curve in case of a.analyte and product are colorless;titrant is color b.product is colored;analyte and titrant are colorless c.analyte is colored;product and titrant are colorless (9分) 8.give a method to measure pH in a single cell?(10分) 9.The following diprotic acids give different shape of titration curves. Why?(9分) 10.What is isoelectric point?Describe the technique of isoelectric focusing for the determination of protein mixture?(10分) 11.The dissociation constant Kd for CaSO4 in aqueous solution has a value of 5.3X10^-3 , its solubility product is 2.6X10^-5. Calculate the solubility of calcium sulfate in water.(10分) 12.Low concentration of Ni-EDTA near the detection limit gave the following counts in a mass spectral measurements: 175,104,164,193,131,189,155,133,151,176.Ten measurements of a blank had a mean of 45 counts.A sample containing 1.00μM Ni-EDTA gave 1797 counts . Estimate the detection limit for Ni-EDTA.(12分) --

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