2011-6分析化学期终样卷及答案

东南大学考试卷（B卷）

适用专业样卷考试形式闭卷考试时间长度120分钟

（可携带计算器）

一、选择题（每题2分，共15题，共30分）

1. In which one is there 4 significant figures: ( B )

A. 0.125

B. 0.001305

C. 3.05×104

D. 0.0305

2. Write answer with the correct number of digits for the equation log (2.20 × 10-10) = ? ( D )

A. -9.6576

B. -9.66

C. -9.7

D. -9.658

3. Which of the following choices cannot function as a Bronsted-Lowry acid?( B )

A. H2O

B. NH3

C. HSO3-

D. HOCl

E. HI

4. Two aqueous solutions are mixed: 25ml of HCl (pH=1) and 25ml of HCl (pOH=13).What is the pH value of the resulting solution?（A）

A. 1

B. 13

C. 7

D. 6

5. What is the pH of 0.10 mol/L H2Se solution that has the stepwise dissociation constants K a1=1.3×10-4 and K a2=1.0×10-11? ( A )

A. 2.44

B. 3.89

C. 4.89

D. 5.50

6. The value of K sp for Fe(OH)3is 2.6 ×10–39. What is the solubility of Fe(OH)3in mol/L? （B）

A. 1.7 × 10–10 mol/L

B. 2.6 × 10–18 mol/L

C. 2.9 × 10–20 mol/L

D. 9.9 × 10–11 mol/L

7. The Cl-content is directly analyzed by Mohr’s method at pH=11, introducing ( A ) in the final result.

A．a positive error B．a negative error C．an uncertain error D．no change

8. What is the electrode potential at the equivalence point for Ce4+ titrated with Fe2+(φθ’(Fe3+/Fe2+) =0.68V, φθ’(Ce4+/Ce3+)=1.44V)?（B）V.

A. 0.38

B. 1.06

C. 1.32

D. 1.49

E. 0.89

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9. For the reaction: Ce4+ +Fe2+Ce3+ +Fe3+(φθ’(Fe3+/Fe2+) =0.68V, φθ’(Ce4+/Ce3+)= 1.44V), lgKθ’=?（ A ）

059 .0

1 )

68

.0

44

.1(⨯

-

=

A

059

.0

2 )

68

.0

44

.1(⨯

-

=

B

059 .0

1 )

44

.1

68

.0(⨯

-

=

C

059

.0

2 )

44

.1

68

.0(⨯

-

=

D

10. Which statement is incorrect?

11. What is the pH of a buffer solution

12. For which should the solubility of AgCl in the following solution be lowest?

13. Indicate how many significant figures there are in:

(a) 0.305 0 (b) 0.003 050 (c) 1.003 × 104

solution:(a) 4 (b) 4 (c) 4

14. Round each number as indicated:

(a) 5.124 8 to 4 significant figures：5.125

15. Which buffer system will have the greatest buffer capacity at pH 8.5?

16. What is the concentration of total free EDTA ion at

二、填空题（第1题8分，第2题3分，第3题3分，第4题8分，第5题8分，共30分）

1. Write each answer with the correct number of digits:

(a) 3.021 + 8.99 = 12.01

2. Identify the Brønsted-Lowry acids on both sides of the reaction:

3. Identify the conjugate acid-base pairs in the reaction:

4. Calculate the concentration of H+ and the pH of: (a) 0.001 0 mol/L HClO4

5. What fraction of the total H+ in this solution is derived from dissociation of water?

6. Given that the K a value for HA is , calculate K b for A-

7. Write a charge balance equation for an aqueous solution of HA-

8. Write a mass balance equation for an aqueous solution of HA-

9. Write a proton balance equation (PBE) for an aqueous solution of HA-

10. Consider the titration of 20.00mL of 0.02132 mol·L-1KCl with 0.02010 mol·L-1 AgNO3(K sp(AgCl)=1.6×10-10). At the equivalence point, the volume of added AgNO3: ; pAg+ : . When the volume of added AgNO3 is 20.00 mL, pAg+ : . When the volume of added AgNO3 is 27.60 mL, pAg+ : .

11. Calculat e the maximum lgαY(H) values for effectively titrated 0.02 mol·L-1 A2+, B2+ and C2+

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