Question

The nature of colloidal solution obtained when excess $Fe{Cl}_3$ is added in precipitate of $Fe{\left(OH\right)}_3$?

• A. positively charged
• B. negatively charged
• C. no charge
• D. All of the above

Answer 1

The correct option is A positively charged

Peptization takes place forming a positively charged colloidal sol of $Fe(OH{)}_3$

Peptization is a process of passing of a precipitate into colloidal particles on adding suitable electrolyte. The electrolyte added is known as peptizing agent. A few examples of sols obtained by peptization are given below:

A reddish brown colored colloidal solution is obtained by adding small quantity of ferric chloride solution to the freshly precipitated ferric hydroxide.