1.

In an experiment, addition of 4.0 mL of 0.0005 MBaCI_(2)to 16.0 mL of arseniussol justcauses complete coagulationin 2hrs. The flocculatingvalueof the effective ion is

Answer»

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

Solution :`As2_(2)S_(3)`SOL is negativelycharged OWING to preferentialadsorptionof ` S^(2-)` ions. Cation would be effective in causingcoagulation.
Flocculating value = minimum millimolesof the effectiveion perlitre of sol `= (4 xx 0.005)/( (4+16) xx 10^(-3)) = 1.0`


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