Engineering
Chemistry
Adsorption
Colloids Preparation and Properties
Question
A colloidal solution of ferric oxide is prepared by two different methods as shown below. [HOTS]
i. What is the charge on colloidal particles in two test tubes (A) and (B)?
ii. Give reasons for the origin of charge.
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Solution
i. Colloidal particles of test tube (A) are positively charged whereas colloidal particles of test tube (B) are negatively charged.
ii. In test tube (A),Fe3+ is adsorbed on the precipitate Fe2O3.xH2O [or Fe2O3.xH2O/Fe3+ is formed].
In test tube (B),OH– ion is adsorbed on the precipitate Fe2O3.xH2O [or Fe2O3.xH2O/OH– is formed].