Get premium membership and access revision papers, questions with answers as well as video lessons.
Introduction To Classical Analysis And Separation Techniques Question Paper
Introduction To Classical Analysis And Separation Techniques
Course:Bachelor Of Science
Institution: Kenyatta University question papers
Exam Year:2010
Page 1 of 3
KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE
SCH 103: INTRODUCTION TO CLASSICAL ANALYSIS AND
SEPARATION TECHNIQUES
=================================================================
DATE: WEDNESDAY 23RD DECEMBER 2009 TIME: 2.00 P.M. – 4.00 P.M.
INSTRUCTIONS
Answer ALL Questions and Show All the Workings where necessary.
1. a) Explain the following
i) A buffer
ii) Repeatability
iii) indirect titration
iv) Contamination
v) Occlusion
vi) Planar chromatography
vii) Adsorption indicators
viii) Reproducibility
ix) Distribution ration
x) Analytical chemistry (10 marks)
b) what are the three major sources of error in analytical chemistry? (3 marks)
c) The chromium concentration of blood of a diabetic person analyzed by two
methods (µg) was as follows:
Page 2 of 3
New method: 2.06, 1.93, 2.12, 2.16, 1.89, 1.95
Standard method: 2,35, 2.44, 2.70, 2.48, 2.44
Is there any significant difference in the means of the two methods? (4 marks)
d) Seven replicate measurements of any analysis gave the following results:
5.12, 5.20, 5.15, 5.16, 5.19, 5.15, 5.18.
i) Is there any evidence of systematic errors at 95% confidence level?
ii) Calculate the average deviation.
iii) Apply the Q and 4d tests to determine whether 5.12 is an outlier. (12
marks)
2. a) i) A KU student found a silver coin and wanted to know its value.
Assuming you are the lucky person given the task of findings its value
and that the only method available to you is gravimetric
analysis, explain the steps you would take in determining the
percentage of silver in the coin.
3. 0.128g sample of primary standard Na2C204 (Na = 23, C=12, O = 16) required
33./31 mls of KMnO4 to reach end point . Balance the equation below and
calculate the morality of KMnO4 solution.
5C2O4 -(aq) + MnO4
2-(aq) + 16H+(aq) 2Mn2+ (aq) + 10C2(g) + 8H2(O(1)
b) Calculate the:1
i) mass of NaOH (FW 40 g/mol) required to prepare 1.5 L of 0.5 M
solution? (5 marks)
ii) mass of Na2 CO3 (FW 105.99 g/mol) required to make 500 ppm of
Na+ (AM of Na is 23g/mol) stock solution?
Page 3 of 3
iii) pH and pOH of 2.0 x 10-3 N acetic acid solution (Ka = 1.76 x 10-5).
(5 marks)
4. a) The distribution co-efficient for compound Z between hexane and water is
6.25. Calculate the percent remaning of Z in 25 ml of water that was
originally 0.06 M in a compound Z after
i) One extraction with one 25.0 ml portion
ii) Two 12.5 ml portions
ii) Three portions of n-hexane (6 marks)
b) You are given a solution containing the following ions Ba2+, Ca2+ and Mg2+.
Explain a technique you would use for a complete separation of the metal
ions. Why would you choose the method? (4 marks)
c) i) What is standard solution?
ii) Give three requirements of a primary standard. (4 marks)
More Question Papers
Popular Exams
Return to Question Papers