100 ml of 0.0018% (w/v) soln of Cl^- ion was the minm conc of Cl^- reqd to precipitate a negative sol in one h .The coagulating value of Cl^- ion is what?
Answers
Answer:
Correct option is D)
Hardy-Schulze Rule :
According to this rule, greater is the valency of coagulating ion, greater its power to cause precipitation. This is known as Hardy-Schulze rule.
Coagulation value or Flocculation value :
It needs to be noted that the coagulation of a colloidal solution by an electrolyte does not take place until the added electrolyte has a certain minimum concentration in the solution. The minimum concentration of electrolyte in millimoles required to cause coagulation of one litre of colloidal solution is called coagulation value.
The minimum coagulating value will be for the ion with maximum charge and since the sol particles are negatively charged, positively charged ions are required for coagulation so Ba
2+
have minimum coagulating value.
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