What are the main reasons for the coagulation of sols?

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Solution

Coagulation:
“When the colloidal particles are settled down as a precipitate, this phenomenon of colloidal solutions is known as Coagulation.”
Factors that cause coagulation of sols:
Addition of electrolyte: When a small amount of electrolyte is added to the sol, coagulation can occur.
Addition of solvent: By adding a suitable solvent such as alcohol as well as acetone is added to hydrophilic sols, the dehydration of the dispersed phase occurs.

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