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JAMB Chemistry 1997 Question 18

Question 18

Acids, Bases and Salts

The hydroxyl ion concentration, [OH−], in a solution of sodium hydroxide of pH 10.0 is

  1. A.10−10 mol dm−3
  2. B.10−6 mol dm−3
  3. C.10−4 mol dm−3
  4. D.10−2 mol dm−3
Show the answer and explanation

Answer: C (10−4 mol dm−3)

Explanation

pOH = 14 − 10 = 4, so [OH−] = 10−4 mol dm−3.