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Question

For coagulation of 250 mL of Fe(OH)3 sol, 2 mL of 1 M Na2SO4 electrolyte is required. What is the coagulating value of Na2SO4 electrolyte?

A
6
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B
8
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C
4
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D
5
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Solution

The correct option is B 8
Coagulation value is the minimum concentration of electrolyte in millimoles required to cause coagulation of one litre of colloidal solution.

Here, 250 mL of Fe(OH)3 sol is coagulated by 2 mL of 1 M Na2SO4 electrolyte

For 250 mL 2 mL of 1 M Na2SO4
No of millimoles=2×1
No of millimoles=2
2 millimoles for 250 mL
For 1000 mL (1L) =4×2=8 mmol
Coagulation Value = 8

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