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Question 600419
JEE Chemistry · Hard

Chemical and Ionic Equilibrium: Weak base MCQ

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Weak baseHardQuestion 600419

Question

The pH of a 0.1 M NH₃ solution (Kb = 1.8×10⁻⁵) is approximately:
  1. A
    11.13
    Correct
  2. B
    5
  3. C
    9
  4. D
    7

Correct answer

11.13

Explanation

[OH⁻] = √(Kb×C) = √(1.8×10⁻⁵×0.1) = √(1.8×10⁻⁶) ≈ 1.34×10⁻³. pOH = 2.87. pH = 14−2.87 ≈ 11.13.

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