Question

When mixture of alum in water is allows to stand for an hour.
(i) No sediment is observed
(ii) Alum obtained as sediment
(iii) After I hour sediment is observed
(iv)On adding sugar sediment is observed.



plz answer.....urgent

Answer 1

Transfer the solution to a 15-liter beaker; add 1 N NaOH dropwise with constant stirring to adjust to pH 6. Mix well, let stand for 1 hour, and filter through a GF/C ...

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Answer 2

Explanation:

Alum creates a precipitate because it cannot dissolve in water. Smaller particles in the water stick to the alum precipitate, forming bigger particles. As the precipitate settles out of the water, it takes with it much of the suspended soil, chemicals, and organisms.