Chemistry - Surface Chemistry Question with Solution | TestHub

ChemistrySurface ChemistryColloids and their ClassificationsMedium2 minQB

ChemistryMediuminteger

Passage / Comprehension

The minimum concentration of an electrolyte in millimoles per litre required to cause precipitation of one litre of a colloidal solution in two hours is called (coagulation value or flocculation value) of the electrolyte for the sol. The smaller the quantity needed, the higher will be the coagulating power of an ion.

In an experiment, addition of 4.0 mL of $0.005 M BaCl_{2}$ to 16.0 mL of arsenious sulphide sol just causes the complete coagulation in 2h . The flocculating value of the effective ion is :

Answer:

Solution:

Moles of $Ba^{+ 2} = 20 \times 1 0^{- 3} m mol$ .

For 16 ml of $As_{2} S_{3}$ sol $= 20 \times 1 0^{- 3} m mol$ of $Ba^{+ 2}$ is required

For 1000 ml of $As_{2} S_{3} sol = [\frac{20 \times 1 0 ^{- 3}}{16} \times 1000] = 1.25 m mol$ of $Ba^{+ 2}$ is required Flucculation value of $Ba^{+ 2} = 1.25$

Stream:JEESubject:ChemistryTopic:Surface ChemistrySubtopic:Colloids and their Classifications

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...