Surface Chemistry - Result Question 2
2. Peptisation is a
(a) process of bringing colloidal molecule into solution
(b) process of converting precipitate into colloidal solution
(c) process of converting a colloidal solution into precipitate
(d) process of converting soluble particles to form colloidal solution
(2019 Main, 12 April I)
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Answer:
Correct Answer: 2. (b)
Solution:
Peptisation is a process of converting precipitate into colloidal solution. This process involves the shaking of precipitate with the dispersion medium in the presence of small amount of electrolyte. The electrolyte added is called peptising agent. During peptisation, the precipitate adsorbs one of the ions of the electrolyte on its surface. This causes the development of positive or negative charge on precipitates, which ultimately breakup into smaller particles of the size of a colloid.
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