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What indicates the permanent hardness when alum is added to water?

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+1 vote
in Environmental Engineering by (81.4k points)
What indicates the permanent hardness when alum is added to water?

(a) Al (OH)3

(b) CaSO4

(c) CO2

(d) Ca (OH)3

This question was posed to me in semester exam.

I'm obligated to ask this question of Sedimentation with Coagulation in portion Sedimentation of Environmental Engineering

1 Answer

+2 votes
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Best answer
Right answer is (b) CaSO4

The best I can explain: The presence of calcium sulfate indicates the permanent hardness in water when alum is added to water.

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