Question

What is coagulation?

Answer 1

Coagulation:

• Coagulation is the aggregation or accumulation of colloidal particles to form a precipitate.
• Coagulation is caused by the removal of colloidal particle charge.
• On their surfaces, colloidal particles have the same charge.
• A colloidal solution is stable due to charge.
• The electrostatic force of repulsion between similarly charged particles keeps them from colliding and forming larger particles.
• The repulsion between them ends when the charge is removed.
• As the particles become closer, their size increases, resulting in precipitation.

Coagulation techniques:

• Electrophoresis: In this method, the colloidal particles move towards the oppositely charged electrodes and get discharged and precipitated.
• mixing two oppositely charged sols: In this method, equal amounts of oppositely charged particles are mixed and then they cancel out their charges and get precipitated.
• Persistent dialysis: In this method, the parts of electrolytes are removed completely and the colloidal solution finally coagulates.
• Addition of electrolytes: When excess amount of electrolyte is added, then the colloidal particles are precipitated.