課程名稱︰ 分析化學乙上
課程性質︰ 必修
課程教師︰ 張煥宗
開課學院： 生科院
開課系所︰ 生技系
考試日期（年月日）︰ 2008-01-18
考試時限（分鐘）： 120min
是否需發放獎勵金： 是~
（如未明確表示，則不予發放）
試題 :
I.Fill in the blanks (4% each)
1.(a)The chemical formula of EDTA is ___________________
(b)EDTA forms complexes with metal ions in a molar ratio of ____________
(c)the order(high-low) for the formation constants for the complexes of EDTA
with Fe3+, Fe2+, Ca2+, K2+, and Co3+ is: _______________
2.Predict the order(high-low) of the reduction potential of the complexes of
copper ions with water, amine, and EDTA is ________________
3.______________is a good masking agent for titrating Mg2+ with EDTA in the
presence of Ag+ and Pd2+
4.(a)The chemical structure of aquacyanobis(ethylenediamine)cobalt(III)chloride
is __________________.
(b)The oxidation number of molybdenum in Na2[MoOCl4] is ___________
5.What is chelate effect? _________________________
6.How can EDTA titration be applied to determination of CO3 2- ?____________
7.How can EDTA titration be applied to determination of Ag+? ________________
8.How can EDTA titration be applied to determination of Mg2+ and Fe3+?______
9.(a)The concentratino of Y4- in 0.1M EDTA at pH8.0 and 13.0 are ____________
and _______________, respextively.(pK1 0.0, pH2 1.5, pK3 2.00, pK4 2.69,
pK5 6.13, pK6 10.37)
(b)If the formation constant for MY2- is 12.00, its conditional formation
constant at pH 8.0 is _____________
(c)The concentration of the metal ion is _______________ in 0.1M MY2- in the
presence of 0.1M EDTA
10.How can the potassium ions in water be determined by EDTA titration? ______
11.How can Mn2+, Mg2+, and An2+ be determined in a mixture containing the three
ions by conducting EDTA titration? ______________________________________
II Consider the titration of 100.0mL of 1.0mM Zn2+ with 1.0mM EDTA at pH10.0 in
the presence of 0.1M NH3. (Kf for ZnY2- = 10^16.50)
(A)Find the concentration of Zn2+ before adding EDTA. (β1:10^2.18;
β2:10^4.43; β3:10^6.74; β4^8.70) (6%)
(B)Find the conditional formation constant for ZnY2-. (6%)
(C)Find pZn2+ after addition of 10, 100, and 110mL EDTA. (α下標Y4- = 0.36)
(18%)
(D)Use titration curves to show the impact of pH on EDTA titration of Zn2+.
(6%)
(E)If ethylenediamine is used instead of NH3 to control pH, what changes in
the titration curve will be observed? (6%)
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