WAEC Chemistry 2020 Objective — Question 32
Question 32 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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When 250 cm^3 of a saturated solution of CuSO4 at 30 C was evaporated to dryness, 5.0 g of the salt was obtained. What is the solubility of the salt at 30 C? [CuSO4=160]
- A. 0.031
- B. 0.125Correct
- C. 0.640
- D. 1.560
Explanation
Mole of CuSO4 = 5.0g/160gmol^-1 = 0.03125 mol. Volume=250cm^3=0.25dm^3. Solubility(in mol/dm^3)=0.03125mol/0.25dm^3=0.125 mol/dm^3.
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