WAEC Chemistry 2019 Objective — Question 17
Question 17 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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What is the solubility of a salt X at 25°C if the saturated solution of the salt contains 0.28 g in 100 cm³ of solution? [X = 56.0 g]
- A. 0.05 moldm⁻³Correct
- B. 0.10 moldm⁻³
- C. 2.60 moldm⁻³
- D. 2.80 moldm⁻³
Explanation
Moles of X = 0.28/56 = 0.005 mol in 100 cm³ = 0.1 dm³. Solubility = 0.005/0.1 = 0.05 moldm⁻³.
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