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National Open University Exam Past Question – CHM413 JUNE/JULY EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA CHM413 ANALYTICAL CHEMISTRY II

14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY JUNE/JULY EXAMINATION

 

COURSE CODE: CHM413

COURSE TITLE: ANALYTICAL CHEMISTRY II TIME ALLOWED: 2 hours

INSTRUCTION: Answer any four questions

 

Question 1

 1

(a)   Define the term “error”.                                                                                     (2 2  marks)

(b)  List and discuss the various types of error.                                                         (10marks) (c)    Distinguish between accuracy and precision.                                                      (5 marks)

 

Question 2

Seven measurements of the pH of a buffer solution gave the following results:

5.12, 5.20, 5.15, 5.17, 5.16, 5.19, 5.15

Calculate:

  1. i) Mean
  2. ii) Median

iii)    Standard deviation

 1

  1. iv) The 95% confidence limits for the true pH  (17 2  marks)

 

Question 3

 1

  1. a) Describe the basic components of a pH –meter  (7 2  marks)
  2. b) List and explain the factors that affect the conductivity of an electrolyte s (10marks)

 

Question 4

  1. a) Briefly explain the following terms:
  2. i) retention time ii) mobile phase     iii)   chromatography      iv) analyte           (10marks)
2
  1. b) Differentiate between thin layer chromatography and column chromatogra  (7 1  marks)

 

 

 

Question 5

 1

  1. a) Enumerate and explain five applications of the differential scanning ca  (7 2  marks)
  2. b) Explain the basic principle of a liquid membrane ele  (10marks)

 

Question 6

 

  1. a) Discuss the various steps involve in preparation of c                            (5marks)
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 1
  1. b) Discuss the factors that affect the conductance of electrolyte solutions.           (7 2  marks)
  2. c) Explain the basic principle of ion-exchange chromatography.  (4marks)

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