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2010-6分析化学样卷
东 南 大 学 考 试 卷(B)
课程名称 分析期终 考试学期 -10-3 得分 适用专业 卷考试形式 卷 考试时间长度 120分钟 共 页
一、 选择题(30分)
填空题(0分题)
三、计算题(0分 4题)Indicate how many significant figures there are in:
(a) 0.305 0 (b) 0.003 050 (c) 1.003 × 104
解:(a) 4 (b) 4 (c) 4
2. Round each number as indicated:
(a) 5.124 8 to 4 significant figures:5.125
3. Write each answer with the correct number of digits:
(a) 3.021 + 8.99 = 12.01
4. Calcium in a mineral was analyzed five times by the same method:0.0271,0.0282,0.0279,0.0271,0.0275. Calculate the following. (a) mean (b) median (c) percent average deviation (relative average deviation) (d) percent standard deviation(relative standard deviation, coefficient of variation, CV).
5. Using the Q test, decide whether the value 1.956 should be rejected from the set of results:
6. Identify the Br?nsted-Lowry acids on both sides of the reaction:
7. Identify the conjugate acid-base pairs in the reaction:
8. 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
solution that has the stepwise dissociation constants Ka1=1.3×10-4 and Ka2=1.0×10-11? ( A )
A. 2.44 B. 3.89 C. 4.89 D. 5.50
10. Calculate the concentration of H+ and the pH of: (a) 0.001 0 mol/L HClO4 What fraction of the total H+ in this solution is derived from dissociation of water? fraction of dissociation
11. Given that the Ka value for HA is , calculate Kb for A-
12. Write a charge balance equation for an aqueous solution of HA-
13. Write a mass balance equation for an aqueous solution of HA-
14. Write a proton balance equation for an aqueous solution of HA-
15. How many milligrams of oxalic acid dihydrate, H2C2O4·2H2O (FM 126.07 g·mol-1), will react with 1.00 mL of 0.027 3 mol·L-1 ceric sulfate (Ce(SO4)2) if the reaction is: H2C2O4 + 2Ce4+→2CO2 + 2Ce3+ + 2H+ (sometimes the reaction equation is not given)
16. Consider the titration of 20.00 mL of c1 mo
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