1.

In an experiment addition of 4.0 mL of 0.005 M BaCl_(2) to 16.0 mL of arsenius sulphide sol just causes complete coagulation in 2 hrs. The flocculating value of the effertive ion is

Answer»

`CI^(-)` 1.0
`Cl^(-)`, 2.0
`Ba^(2+), 1.0`
`Ba^(2+),0.5`

SOLUTION :`As_(2)S_(3)` sol is negatively charged owing to preferential adsorption of `S^(2-)` ions. Cation would be effective in causing COAGULATION.
Flocculating value = minimum millimoles of the effective ion PER litre of sol `= (4 xx 0.005)/((4+16)xx 10^(-3))`


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