CH 1502 – ANALYTICAL CHEMISTRY

Date & Time: 20/04/2009 / 1:00 – 4:00 Dept. No. Max. : 100 Marks

PART –A

Answer ALL the questions (10 x 2 = 20 marks)

Mention the threshold limits of a vapour concentration of mercury, chromic acid, hydrogen sulphide and formaldehyde.
Repeated estimation of the percentage of carbon in a certain organic compound yielded the result, 38.42, 38.02 and 38.22 in three trials. What is the ‘spread’ of the above set of data?
State any two conditions for a good fractionation.
What is meant by partition chromatography?
If 0.4 g of NaOH is dissolved in water to give 500 ml solution what will be molarity of the solution?
Distinguish a primary standard from a secondary standard.
Define ‘Concentration solubility product’.
What are masking agents?
What are the properties measured in TG and DTG methods?
What do you understand by the term ‘reaction interval’ in thermal analysis?

PART – B

Answer any EIGHT questions (8 x 5 = 40 marks)

Describe the calibration of a burette and a volumetric flask.
List out any five advantages of using a standard glass joint apparatus.
Assess the average deviation from the ‘mean’ and also from the ‘median’ of the percentage of chloride obtained in three trials, namely, 24.39, 24.19 and 24.36.
Describe ‘hot filtration’ and give its significance.
Outline the preparation and development of ‘plates’ for a TLC study.
Explain, briefly, the various steps involved in recrystallization of a solid.
What are metallochoromic indicators? Outline the principle and conditions for using such indicators.
Calculate the pH of the solution obtained by mixing 5.0 g of acetic acid and 7.5 g of sodium acetate and making the volume equal to 500 mL. Given: the dissociation constant of acetic acid is 1.75 x 10^-5 at 298 K.
Write an account of complexometric titrations.
Find out the solubility of magnesium hydroxide in g L^-1 if its solubility product is

1.20 x 10^-11 at 25^oC. (Mg = 24, O=16, H=1).

PART – C

Answer any FOUR questions (4 x 10 = 40 marks)

Write a detailed account of various kinds of determinate and indeterminate errors in analysis.
Discuss the principle, experimental technique and applications of ion-exchange

chromatography.

Write notes on: (i) reduced pressure distillation (ii) electron capture detector in GC.
Discuss the theory of acid-base indicators with two examples.
(i) Describe post precipitation. (ii) How is post precipitation different from coprecipitaion?

(iii) Mention any three requisites of a wash liquid.

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