WAEC Chemistry 2018 Objective — Question 15
Question 15 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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Consider the following sketch of the solubility curve of some substances. At what temperature does the solubility of KNO₃ equal that of NaNO₃?
- A. 0°C
- B. 20°CCorrect
- C. 30°C
- D. 40°C
Explanation
The solubility of KNO₃ equals that of NaNO₃ at the temperature where their solubility curves intersect — about 20°C.
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