GATE CE 2022 Set 1 — Question 22
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Environmental Engineering → Water Quality → pH, Turbidity, Hardness & Alkalinity
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Question
The total hardness in raw water is 500 milligram per liter as . The total hardness of this raw water, expressed in milligram equivalent per liter, is(Consider the atomic weights of Ca, C, and O as 40 g/mol, 12 g/mol, and 16 g/mol, respectively.)
Correct answer
(A) 10
Solution
Total hardness is given as 500 mg/L as .
To express this in milligram equivalent per liter (meq/L), we use the formula:The molecular weight of g/mol.
The valency of is 2, so the equivalent weight of g/eq or 50 mg/meq.Therefore, the correct option is (A).
To express this in milligram equivalent per liter (meq/L), we use the formula:The molecular weight of g/mol.
The valency of is 2, so the equivalent weight of g/eq or 50 mg/meq.Therefore, the correct option is (A).
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