Question
How will you prepare silver sol by Bredig’s Arc method?
Solution
Answer:
It involves dispersion as well as condensation.
colloidal sols of metal such as gold, silver, plantium etc. can be prepared by the this method.
Colloidal solution of silver is prepared by the condensation of vapours. This is done by striking an electric arc between two rods of silver, the ends of which are kept immersed under water in a well cooled vessel, containing a stabilizer. (See Fig.) The intense heat of the arc tear off the end of the silver rods to form vapour of silver which then at once condense to give particles of colloidal size. The presence of a trace of KOH in water stabilizes the colloidal sol so formed.
Fig. Bredig’s Arc Method.
It involves dispersion as well as condensation.
colloidal sols of metal such as gold, silver, plantium etc. can be prepared by the this method.
Colloidal solution of silver is prepared by the condensation of vapours. This is done by striking an electric arc between two rods of silver, the ends of which are kept immersed under water in a well cooled vessel, containing a stabilizer. (See Fig.) The intense heat of the arc tear off the end of the silver rods to form vapour of silver which then at once condense to give particles of colloidal size. The presence of a trace of KOH in water stabilizes the colloidal sol so formed.
Fig. Bredig’s Arc Method.
