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Two sparingly soluble salts, MY and NY3, each have the same solubility product constant, Ksp = 6.2 × 10⁻¹³, at room temperature. Which of the following statements is correct for these two salts?
- The molar solubilities of MY and NY3 in water are the same.
- The molar solubility of MY in water is lower than that of NY3.
- Both salts become more soluble in 0.5 M KY than they are in pure water.
- Adding KY to solutions of MY and NY3 does not change their solubilities.
Correct answer: The molar solubility of MY in water is lower than that of NY3.
Solution
The molar solubility of MY is lower than that of NY3 because MY dissociates into fewer ions compared to NY3, which produces more ions upon dissolution. Since Ksp is the same for both salts, the salt with more ions in solution (NY3) will have a higher molar solubility.
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