PRACTICAL CHEMISTERY
PRACTICAL CHEMISTERY
Exaperiment
1:- Name of Excitement AIM:Prepare colloidal solution (of sol.) starch
APPARATUS
Two beakers or conical flasks each of 250 CM³ capacity, a funnel, filter paper, pestle and mortar, glass-rod, tripod stand etc.
MATERIALS
Starch (soluble )1 g, distilled water.
THEORY
Starch forms a stable hydrophillic sol with water at about 100°C.
PROCEDURE
Grind about one gram of starch (soluble) with a few cm³ of distilled water to make a thin paste. Pour this paste gradually into about 100 cm³ of boiling water taken in a beaker with constant shaking and stirring with a glass rod. Boil the contents for about 3-4 minutes and then cool. Filter the contents though filter paper. The ’filtrate’ is the required starch sol.
Fig. 1. preparation of starch sol.
PRECAUTIONS
The apparatus used for preparing the soldiers should be properly cleaned.
Distilled water should always be used while preparing sols in water.
constant stirring of the contents in necessary during preparation of the sol.
Exaperiment
1:- Name of Excitement AIM:Prepare colloidal solution (of sol.) starch
APPARATUS
Two beakers or conical flasks each of 250 CM³ capacity, a funnel, filter paper, pestle and mortar, glass-rod, tripod stand etc.
MATERIALS
Starch (soluble )1 g, distilled water.
THEORY
Starch forms a stable hydrophillic sol with water at about 100°C.
PROCEDURE
Grind about one gram of starch (soluble) with a few cm³ of distilled water to make a thin paste. Pour this paste gradually into about 100 cm³ of boiling water taken in a beaker with constant shaking and stirring with a glass rod. Boil the contents for about 3-4 minutes and then cool. Filter the contents though filter paper. The ’filtrate’ is the required starch sol.
Fig. 1. preparation of starch sol.
PRECAUTIONS
The apparatus used for preparing the soldiers should be properly cleaned.
Distilled water should always be used while preparing sols in water.
constant stirring of the contents in necessary during preparation of the sol.
