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The minimum concentration of an electrol...

The minimum concentration of an electrolyte required to cause coagulation of a sol is called its flocculation value. It is expressed in millimoles per litre. If the flocculation value of `MgSO_(4)` for standard `As_(2)S_(3)` sol is 3.33. How many milligrams of `MgSO_(4)` is to be added to 20 ml standard `As_(2)S_(3)` sol so that flocculation just starts ?

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