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JAMB Chemistry 2013 Question 19

Question 19

Acids, Bases and Salts

Three drops of a 1.0 mol dm−3 solution of HCl was added to 20 cm3 of a solution of pH6.4. The pH of the resulting solution will be

  1. A.close to that of pure water.
  2. B.less than 6.4.
  3. C.greater than 6.4.
  4. D.unaltered.
Show the answer and explanation

Answer: B (less than 6.4.)

Explanation

Adding a strong acid increases the H+ concentration, so the pH falls below 6.4.