Chemistry Laboratory IV

Inorganic Chemistry                                                                         (30 Hours)

Mixture Analysis:                                                                              

Semi-micro qualitative analysis of inorganic mixtures (Two anions and two cations, excluding insoluble salts):

Cations : NH₄⁺, Pb²⁺, Ag⁺, Bi³⁺, Cu²⁺, Cd²⁺, Sn²⁺, Fe³⁺, Al³⁺, Co²⁺, Cr³⁺, Ni²⁺, Mn²⁺, Zn²⁺, Ba²⁺, Sr²⁺, Ca²⁺, K⁺

Anions : CO₃^2– , S^2–, SO₂^–, S₂O₃^2–, NO₃^–, CH₃COO^–, Cl^–, Br^–, I^–, NO₃^–,SO₄^2-, PO₄^3-, BO₃^3-,C₂O₄^2-,F^-

(Spot tests should be carried out wherever feasible)

Physical Chemistry                                                                         (30 Hours)

1. Surface tension measurement (use of organic solvents excluded).

a) Determination of the surface tension of a liquid or a dilute solution using a

stalagmometer.

b) Study of the variation of surface tension of a detergent solution with concentration.

2.Viscosity measurement (use of organic solvents excluded).

a) Determination of the relative and absolute viscosity of a liquid or dilute solution

using an Ostwald’s viscometer.

b) Study of the variation of viscosity of an aqueous solution with concentration of

solute.

3. Chemical Kinetics

Study the kinetics of the following reactions.

a) Initial rate method: Iodide-persulphate reaction

b) Integrated rate method:

i. Acid hydrolysis of methyl acetate with hydrochloric acid.

ii. Saponification of ethyl acetate.

iii. Compare the strengths of HCl and H₂SO₄ by studying kinetics of hydrolysis of

methyl acetate

Scheme of Examination

  The duration of examination will be 4 hrs.

The following exercises will be set in the examination

Qualitative  Analysis                                                      32 marks

Physical experiment                                                       26 marks

Viva                                                                              12 marks

          Total                                                                                      70 marks       

1. Qualitative Mixture Analysis

The exercise carries 32 marks. Not more than one interfering radical will be given in a mixture of four    radicals.

8 marks shall be awarded for each radical correctly reported.

2 marks will be awarded for each correct radical if only dry test or preliminary tests are   given.

4 marks may be awarded to a candidate if she has approached in systematic and correct manner towards the analysis upto a group in analysis of basic radical or correct indicative test of acid radical. Remaining two mark is reserved for confirmatory test of radical.

2. Physical Chemistry Experiment

The exercise carries 26 marks. The candidates shall be given one exercise out of exercises prescribed in the syllabus. The exercises in physical chemistry can be modified by the examiner and the same will be explained to the candidates. However, such modifications will not involve any departure from the basic principles over which experiments are prescribed in the syllabus.

      The distribution of marks will be as follows

• Theory and procedure                     4 marks
• Correct observation                         7 marks
• Use of correct formula                     4 marks
• Calculation                                      7 marks
• Result                                             4 marks

The constancy in values of rate constants may be taken into consideration while awarding marks in experiments on chemical kinetics.

3. Viva

Oral questions shall generally be asked over the work assigned to the candidate. The purpose is to find out as to what extent the candidate has understanding the basic principles.