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A colloidal solution of ferric oxide is ...

A colloidal solution of ferric oxide is prepared by two different methods as shown below.
a. What is the charge on colloidal particles in the two test tubes `(A)` and `(B)`?
b. Give reasons for the origin of charge.

Text Solution

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Colloidal particles of test tube (A) are positively charged where as colloidal particles of test tube (B) are negatively charged.
In test tube (A). `Fe^(3+)` is adsorbed on the precipitate
`Fe_(2)O_(3).xH_(2)O` [or `Fe_(2)O_(3).xH_(2)O//Fe^(3+)` is formed].
In test tube (B). `overset(ɵ)(OH)` ions is adsorbed on the precipitate
`Fe_(2)O_(3).xH_(2)O` [or `Fe_(2)O_(3).xH_(2)O//overset(ɵ)(OH)` is formed].
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