WAEC Chemistry 2021 Objective — Question 32
Question 32 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.
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32. What is the concentration of a solution which contains 0.28g of potassium hydroxide in 100cm³ of solution? [KOH=56]
- A. 0.01 mol dm⁻³
- B. 0.05 mol dm⁻³Correct
- C. 0.10 mol dm⁻³
- D. 0.50 mol dm⁻³
Explanation
Moles of KOH = 0.28/56 = 0.005 mol. Volume = 0.1 dm³. Concentration = 0.005/0.1 = 0.05 mol dm⁻³.
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