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Unilorin Post-UTME Chemistry 2024 (Model questions) Question 6

Question 6

Acids, Bases and Salts

The pH of a solution increases from 4 to 6. The hydrogen ion concentration becomes

  1. A.half the initial
  2. B.double the initial
  3. C.100 folds the initial
  4. D.one-hundredth its initial value
Show the answer and explanation

Answer: D (one-hundredth its initial value)

Explanation

[H+] goes from 10−4 to 10−6 mol/dm3, a 100-fold decrease, so it becomes one-hundredth of the original.