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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 standard As₂S₃ sol is 3.33. of ${MgSO}_{4}$ How many milligrams of MgSO₄is to be added to 20 ml standard As₂S₃sol so that flocculation just starts ?

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answer is 8.

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Detailed Solution

milli moles required for 20 ml
${As}_{2} S_{3} = \frac{3 .33}{1000} \times 20$
mass in milligram for 20 ml

${As}_{2} S_{3} = \frac{3 .33}{1000} \times 20 \times 120 = 8 milli grams$

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