What is peptization and precipitation?

What is peptization and precipitation?

Peptization or deflocculation is the process of converting precipitate into colloid by shaking it with a suitable electrolyte called peptizing agent. This is particularly important in colloid chemistry or for precipitation reactions in an aqueous solution.

What is peptization and example?

Peptisation is the process of converting a precipitate into colloidal particles by adding suitable electrolyte. The electrolyte is known as peptising agent. It is stabilising agent. For example, the addition of small amount of dil. HCl to stannic oxide precipitate gives a stable sol of stannic oxide.

How can we prevent peptization?

Peptization can be minimized by washing a precipitate with a solution of an electrolyte that is volatilized during an ensuing drying step.

What is peptization and coagulation?

Peptization and coagulation are two chemical processes that can be mainly observed in colloidal dispersions. Peptization is the formation of a colloidal dispersion from a precipitation. Coagulation is the formation of aggregates from oppositely charged particles which are then settled down under gravity.

What is peptization method?

Peptization is the method of producing stable colloids using an electrolyte to split up and distribute a precipitate into the colloids. Peptization utilizes the charges to produce colloids from the precipitate. The electrolyte used in the process is called a peptizing agent.

How is peptization done?

Peptization is the method of breaking down the freshly prepared precipitate particles into the particles of colloidal size. This is done by adding suitable electrolytes. The electrolyte added is called peptizing agent.

What are different methods of peptization?

Peptization can be achieved as follows: i) By adding excess electrolyte to freshly prepared precipitates. `Fe (OH)_2 + FeCl_3 to [Fe(OH)_3Fe]^(3+) + 3Cl^-` ii) By adding another colloids. For example, lamp black is peptized by adding gums. iii) By washing precipitate.

How does peptization occur?

The peptization occurs because as the electrolyte is added to a freshly precipitated substance, the particles of the precipitate preferentially adsorb one particular type of ions of the electrolyte (ions common with the precipitated substance). As a result, they get dispersed due to electrostatic repulsion.

What solution prevents peptization in precipitate?

This occurs as the electric double layer increases as electrolyte is washed from the precipitate. Peptization is minimized by washing with a solution containing a volatile electrolyte. HNO3 is added to the wash solution for this reason.

Is peptization opposite of coagulation?

Peptization means the process by which a coagulated colloid reverts to its original dispersed state. Peptization is the reverse of coagulation (the precipitate reverts to a colloidal state and is lost). It can be avoided by washing with an electrolyte that can be volatized by heating.

What is the cause of peptization?

Cause of peptization: As the electrolyte is added to a freshly precipitated substance, the particles of the precipitate preferentially adsorb one particular type of ions of the electrolyte and get dispersed due to electrostatic repulsion. This gives particles of colloidal size.

What is the reason of peptization?

What is peptization and what are different methods of peptization?

Peptization is the process responsible for the formation of stable dispersion of colloidal particles in dispersion medium. In this method a precipitate is converted into colloidal sol by shaking it with dispersion medium in the presence of small amount of electrolyte.

Is peptization used for coagulation of colloids?

Peptization is the process of forming stable colloids by using an electrolyte to break up a precipitate and disperse it into the colloid. So while coagulation uses charges to disrupt the colloid and form an aggregate, peptization uses charges to form a colloid from a precipitate.

What is the function of Peptizing agent?

Peptizing agent is. Solution : Process of converting precipitate into colloidal particles by adding suitable electrolyte called peptization and stabilizing agent (electrolytes) as peptizing agent.

What is Peptizing agent give example?

The electrolyte used in the process is called a peptizing agent. Example: When the ferric chloride is added to the precipitate of ferric hydroxide, the hydroxide precipitate transfer to the sol by absorbing ferric ions. In simple words, Fe3+ is absorbed on Fe(OH)3 and splits into colloids.

What is role of Peptizing agent in peptization?

In other words it may be defined as a process of converting a precipitate into colloidal sol by shaking it with dispersion medium in the presence of small amount of electrolyte. The electrolyte used in this process is called as peptizing agent.

What is peptization and peptizing agents?

Answer: Peptization is the method of producing stable colloids using an electrolyte to split up and distribute a precipitate into the colloids. Peptization utilizes the charges to produce colloids from the precipitate. The electrolyte used in the process is called a peptizing agent.