[試題] 102上 林萬寅 分析化學丁 期末考
課程名稱︰分析化學丁
課程性質︰必修
課程教師︰林萬寅
開課學院：生農學院
開課系所︰園藝系
考試日期（年月日）︰20140109
考試時限（分鐘）：110分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1.H3PO4 is a triprotic acid with pK1=2.00,pK2=7.00,pK3=12.00.Find the pH value
of the followinf solutions.
(A)0.01M Na2HPO4. 5%
(B)Mix 40mL,0.045M H3PO4 with 60mL,0.050M NaOH. 5%
(C)A solution with [H3PO4]=[PO4-3]. 5%
(D)A solution with [H2PO4-]/[PO4-3]=0.10 5%
2.A 20.0mL 0.200M Ca+2 solution buffered at pH9.0 (αy=0.050) was titrated
with 0.0200M EDTA. Kf(ZnY)=5.0x10^10
(A)Find pCa at the equivalence point. 5%
(B)Find pCa after addition of 30.0mL EDTA. 5%
3.A solution of Sn+2 (40mL,0.010M) was titrated with 0.020M Ce+4 in 1 M H2SO4.
[Ef(Ce+4→Ce+3)=1.44V;(Sn+4→Sn+2)=0.77V]
(A)Calculate the electrode potential after addition of 30.0mL Ce+4. 5%
(B)Calculate the electrode potential after addition of 40.0mL Ce+4. 5%
4.Cell Pb(s)│PbF2(s)│F-(0.020M)││Cl-(0.01M)│AgCl(s)│Ag(s) develops a
potential of 0.568V(E。=-0.126V for Pb→Pb+2,0.222V for AgCl→Ag + Cl-)
(A)Write a balanced cell reaction and find its standard cell potential. 5%
(B)Find the equilibrium constant for the cell reaction in A. 5%
(C)Find the Ksp for PbF2. 5%
5.The following chromatogram shows three bands for the mobile phase(M), solute
A and solute B passing through a 25.0cm column. If the base widths (W) for
bands A and Bare 1.26and 1.42 mins,respectively, answer the following questions.
(圖形題)
(A)Calculate the capacity (retention) factor (ka) for the solute A. 3%
(B)Find the selectivity factor (α) and resolution (Rs)for bands A and B 6%
(C)Calculate the plate height (H) plate count (N) for solute A. 6%
6.Answer the following questions.
(A)Describe the acid error and the alkine error of a pH glass electrode. 4%
(B)Describe the anodic stripping voltammetry. 4%
(C)Describe fluorescence & photomultipiler tube. 4%
(D)Describe the principle of a photomultiplier tube. 4%
(E)Define the inner-filter effect (primary & secondary absorption) 4%
(F)Find the percentage of transmitted light at 450nm for 0.30ppm β-carotene
( C40H56;ε450 = 8200 M^-1˙cm^-1;b = 1.0cm) solution. 5%
(G)Describe the components for a spectrofluorometer. 5%
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