For coagulation of 250mL of Fe(OH)3 sol, 2mL of 1MNa2SO4 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, 250mL of Fe(OH)3 sol is coagulated by 2mL of 1MNa2SO4 electrolyte
For 250 mL →2mLof1MNa2SO4 Noofmillimoles=2×1 Noofmillimoles=2 ∴ 2 millimoles for 250 mL
For 1000 mL (1L) =4×2=8mmol ∴ Coagulation Value = 8