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The chemical composition of Alum is _____________

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+1 vote
in Environmental Engineering by (81.4k points)
The chemical composition of Alum is _____________

(a) Al2 (SO4)3.18H2O

(b) Al2 (SO4)2.18H2O

(c) Al3 (SO4)2.18H2O

(d) Al4 (SO4)3.18H2O

I had been asked this question in a job interview.

My doubt stems from Sedimentation with Coagulation in section Sedimentation of Environmental Engineering

1 Answer

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Best answer
The correct choice is (a) Al2 (SO4)3.18H2O

Explanation: Alum is the most common and universal coagulant used in water treatment having chemical composition Al2 (SO4) 3.18H2O.

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