WAEC Chemistry 2019 Objective — Question 19
Question 19 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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Which of the following solutions containing one mole per dm³ have the lowest pH?
- A. Ethanoic acid
- B. Hydrochloric acidCorrect
- C. Sodium chloride
- D. Sodium hydrogentrioxocarbonate(IV)
Explanation
Hydrochloric acid is a strong acid and fully ionizes, giving the highest H+ concentration and therefore the lowest pH among the options.
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