Question

2 chemistry practical experiments list

Answer 1

(1):- study of the comparative cleansing capacity of a sample of soap in soft and hard water. (2):- a study of the following properties of acetic acid (ethanoic acid):- (a):- odour (b):- solubility in water (c):- effect on litmus

Answer 2

A - Surface chemistry
(a). Preparation of one lyophilic and one lyophobic sol
Lyophilic sol - starch, gum and egg albumin
Lyophobic sol- aluminium hydroxide, ferric hydroxide, arsenous sulphide.
(b). Dialysis of sol-prepared in (a) above.
(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 & 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 lodate, (KIO 3,) & Sodium Sulphite: (Na2SO 3 ,) using starch solution 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 (HCl) and strong base (NaOH).
(iii). Determination of enthalpy change during interaction (Hydrogen bond formation) between Acetone and Chloroform.
D - Electrochemistry
Variation of cell potential in Zn/Zn2+ || Cu 2+ /Cu with change in concentration of electrolytes (CuSO4 or ZnSO4 ) at room temperature.
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).
NCERT Exemplar Class 12 Chemistry – All Chapters
F - Preparation of Inorganic Compounds
(i). Preparation of double salt of Ferrous Ammonium Sulphate or Potash Alum.
(ii). Preparation of Potassium Ferric Oxalate.
G - Preparation of Organic Compounds
Preparation of any one of the following compounds
(i). Acetanilide
(ii). Di -benzal Acetone
(iii). p-Nitroacetanilide
(iv). Aniline yellow or 2 - Naphthol Aniline dye.
H - Tests for the functional groups present in organic compounds:
Unsaturation, alcoholic, phenolic, aldehydic, ketonic, carboxylic and amino (Primary) groups.
I - Characteristic tests of carbohydrates, fats and proteins in pure samples and their detection in given food stuffs.
J - Determination of concentration? Molarity of KMnO 4 solution by titrating it against a standard solution of:
(i). Oxalic acid,
(ii). Ferrous Ammonium Sulphate
(Students will be required to prepare standard solutions by weighing themselves).
K - Qualitative analysis
Determination of one cation and one anion in a given salt.
Cation:- Pb 2+ , Cu 2+ As 3+ , Al 3+ , Fe 3+ , Mn 2+ , Zn2+ , Cu 2+ , Co 2+ , Ni 2+, Ca 2+ , Sr 2+, Ba 2+ , Mg2+ , NH 4+
Anions:- CO 3 2‒ , S 2‒ , SO 3 2‒ , SO 42‒ , NO2 ‒, NO3 ‒, Cl ‒ , Br ‒, I ‒, PO 43‒ , C 2O42‒ , CH3COO ‒
(Note: Insoluble salts excluded )
Project work -
Scientific investigations involving laboratory testing and collecting information from other sources.
A few suggested Projects.
• Study of the presence of oxalate ions in guava fruit at different stages of ripening.
• Study of quantity of casein present in different samples of milk.
• Preparation of soyabean milk and its comparison with the natural milk with respect to curd formation, effect of temperature, etc.
• Study of the effect of Potassium Bisulphate as food preservative under various conditions (temperature, concentration, time, etc.)
• Study of digestion of starch by salivary amylase and effect of pH and temperature on it.
• Comparative study of the rate of fermentation of following materials: wheat flour, gram flour, potato juice, carrot juice, etc.
• Extraction of essential oils present in Saunf (aniseed), Ajwain (carum), Illaichi (cardamom).
• Study of common food adulterants in fat, oil, butter, sugar, turmeric power, chilli powder and pepper.
Note: Any other investigatory project, which involves about 10 periods of work, can be chosen with the approval of the