Page 6 - Chemistry - XII

Practical Syllabus

Micro-chemical methods are available for several of the practical experiments. Wherever possible, such techniques
should be used.

A. Surface Chemistry

(a) Preparation of one lyophilic and one lyophobic sol
Lyophilic sol - starch, egg albumin and gum
Lyophobic sol - aluminium hydroxide, ferric hydroxide, arsenous sulphide.

(b) Dialysis of sol-prepared in above practical.
(c) Study of the role of emulsifying agents in stabilizing the emulsion of different oils.

B. Chemical Kinetics

(a) Effect of concentration and temperature on the rate of reaction between Sodium thiosulphate and
Hydrochloric acid.
(b) Study of reaction rates of any one of the following:
(i) Reaction of Iodide ion with Hydrogen Peroxide at room temperature using different concentration
of Iodide ions.
(ii) Reaction between Potassium Iodate, (KIO ) and Sodium Sulphite: (Na SO ) using starch solution
3
2
3
as indicator (clock reaction).
C. Thermochemistry

Any one of the following experiments
(i) Enthalpy of dissolution of Copper Sulphate or Potassium Nitrate.

(ii) Enthalpy of neutralization of strong acid (HCI) and strong base (NaOH).
(iii) Determination of enthaply change during interaction (Hydrogen bond formation) between Acetone
and Chloroform.

D. Electrochemistry

Variation of cell potential in Zn/Zn || Cu /Cu with change in concentration of electrolytes (CuSO or
2+
2+
4
ZnSO ) at room temperature.
4
E. Chromatography

(i) Separation of pigments from extracts of leaves and flowers by paper chromatography and determination
of Rf values.

(ii) Separation of constituents present in an inorganic mixture containing two cations only (constituents
having large difference in Rf values to be provided).

F. Preparation of Inorganic Compounds

(i) Preparation of double salt of Ferrous Ammonium Sulphate or Potash Alum.
(ii) Preparation of Potassium Ferric Oxalate.