Question

Explain how coagulation of colloid is carried out by 

1. Flectrophoresis 

2. By mixing two oppositely changed sols

3. By boiling

Answer 1

1. Electrophoresis:

 In eleetrophoresis, charged particles migrate to the electrodes of opposite sign. It is due to neutralization of the charge of the colloids. The particles are discharged and sothey get precipitated.

2. By mixing two oppositely charged sols: 

When colloidal sols with opposite charges are mixed, mutual coagulation takes place. It is due to migration of ions from the surface of the particles. 

3. By boiling – 

When colloidal sol is boiled, due to increased collisions, the sol particles combine and settle down.