GATE CE 2020 Set 2 — Question 47
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Environmental Engineering → Water Quality → pH, Turbidity, Hardness & Alkalinity
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Question
Alkalinity of water, in equivalent/litre (eq/litre), is given byWhere, represents concentration in mol/litre. For a water sample, the concentrations of mol/litre, mol/litre and the pH of water = 9.0. The atomic weights are: Ca = 40; C = 12; and O = 16. If the concentration of and are NEGLECTED, the alkalinity of the water sample (in mg/litre as ), is
Correct answer
(A) 130.4
Solution
Alkalinity in eq/L is given by when and are neglected.
Given:
mol/L
mol/LAlkalinity (eq/L) = eq/L.To convert to mg/L as , multiply by the equivalent weight of (50 g/eq) and convert to mg:
Alkalinity (mg/L as ) = .
Given:
mol/L
mol/LAlkalinity (eq/L) = eq/L.To convert to mg/L as , multiply by the equivalent weight of (50 g/eq) and convert to mg:
Alkalinity (mg/L as ) = .
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