GATE CE 2022 Set 2 — Question 42
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Environmental Engineering → Water Quality → pH, Turbidity, Hardness & Alkalinity
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Question
A 100 mg of (strong acid) is added to water, bringing the final volume to 1.0 liter. Consider the atomic weights of H, N, and O, as 1 g/mol, 14 g/mol, and 16 g/mol, respectively. The final pH of this water is (Ignore the dissociation of water.)
Correct answer
(A) 2.8
Solution
1.Calculate the molecular weight of :
g/mol.2.Calculate the number of moles of added:
Mass = 100 mg = 0.1 g.Moles = mol.
3.Calculate the molarity () since is a strong acid and dissociates completely:
Volume = 1.0 L.M.
4.Calculate the pH:
.Rounding to one decimal place, the pH is 2.8.Continue learning with Success Tracker
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