Question
How can be colloids prepared by chemical methods?
✓
Answer
i. Colloidal dispersions can be prepared by chemical reactions leading to formation of molecules by double decomposition, oxidation, reduction or hydrolysis.
ii. Molecules formed in these reactions are water-insoluble and thus, they aggregate leading to the formation of colloids.
e.g.
a. $\quad SO _2+2 H _2 S \xrightarrow{\text { Oxidation }} 3 S \downarrow+2 H _2 O$
b. $\quad 2 AuCl _3+3 HCHO +3 H _2 O \xrightarrow{\text { Reduction }} 2 Au \downarrow+3 HCOOH +6 HCl$
c. $\quad FeCl _3+3 H _2 O \xrightarrow{\text { Hydrolysis }} Fe ( OH )_3 \downarrow+3 HCl$
ii. Molecules formed in these reactions are water-insoluble and thus, they aggregate leading to the formation of colloids.
e.g.
a. $\quad SO _2+2 H _2 S \xrightarrow{\text { Oxidation }} 3 S \downarrow+2 H _2 O$
b. $\quad 2 AuCl _3+3 HCHO +3 H _2 O \xrightarrow{\text { Reduction }} 2 Au \downarrow+3 HCOOH +6 HCl$
c. $\quad FeCl _3+3 H _2 O \xrightarrow{\text { Hydrolysis }} Fe ( OH )_3 \downarrow+3 HCl$
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