Question
Explain the process of peptization Name only one hydrosol.
Solution
Answer:
Peptization may be defined as the process of
converting a precipitate into colloidal sol by shaking it with dispersion medium in the presenceof a small amount of electrolyte. The electrolyte used for this purpose is called peptizing agent.
converting a precipitate into colloidal sol by shaking it with dispersion medium in the presenceof a small amount of electrolyte. The electrolyte used for this purpose is called peptizing agent.
For example, on treating a precipitate of iron (III) oxide with a small amount of FeCl3 solution gives a reddish brown coloured colloidal solution. During peptisation, the suitable ions from the added electrolyte are absorbed by the particles of the precipitate. The charged particles repel one another and form colloidal solution. In this case, Fe3+ ions from ferric chloride are absorbed by Fe(OH)3 precipitate:
