The precipitation of colloidal solution by induced aggregation by the addition of suitable electrolyte is called coagulation.
It is also known as flocculation.
The minimum concentration of an electrolyte required for coagulation is known as coagulating value of solution.
It is expressed in units of milli-moles per liter.
Final Answer: The minimum concentration of an electrolyte required for coagulation is known as coagulating value of solution.