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JAMB Chemistry 1990 Question 20

Question 20

Acids, Bases and Salts

What is the concentration of H+ ions in moles per dm3 of a solution of pH 4.398?

  1. A.4.0 × 10−5
  2. B.0.4 × 10−5
  3. C.4.0 × 10−3
  4. D.0.4 × 10−3
Show the answer and explanation

Answer: A (4.0 × 10−5)

Explanation

[H+] = 10−pH = 10−4.398 ≈ 4.0 × 10−5 mol/dm3.