CBSE Class 12-science Answered
Write short note on dispersion methods of preparation of colloids.
Asked by Topperlearning User | 21 Jun, 2016, 12:58: PM
Expert Answer
There are three dispersion methods:
1. Mechanical dispersion - Suspension dimension are grinded in colloidal mill or ultrasonic disintegrator to colloidal dimensions.
2. Electrical disintegration- Metal sols are prep by making electrode of the metal and immersed in dispersion medium and a electric arc is struck(involves dispersion plus condensation).
3. Peptization- Precipitate is converted into colloids sol by shaking in dispersion medium with an electrolyte called peptizing agent. e.g. Fe(OH)3 ppt + FeCl3. Fe+++ is absorbed on Fe(OH)3 and breaks into colloids.
Answered by | 21 Jun, 2016, 14:58: PM
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