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Question 600426
JEE Chemistry · Hard

Chemical and Ionic Equilibrium: pH of weak acid MCQ

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pH of weak acidHardQuestion 600426

Question

The pH of 0.01 M formic acid (HCOOH, Ka = 1.8×10⁻⁴) is approximately:
  1. A
    2.87
    Correct
  2. B
    3.37
  3. C
    4.74
  4. D
    2.0

Correct answer

2.87

Explanation

[H⁺] = √(Ka × C) = √(1.8×10⁻⁴ × 0.01) = √(1.8×10⁻⁶) ≈ 1.34×10⁻³. pH = −log(1.34×10⁻³) ≈ 2.87.

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