Multiple Choice
Which of the following compounds is least soluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following compounds becomes less soluble in water as the temperature of the solution is increased?
A
NaCl
B
Ce2(SO4)3
C
KNO3
D
NH4Cl
Verified step by step guidance1
Understand that the solubility of most solids in water increases with temperature, but some salts exhibit the opposite behavior, becoming less soluble as temperature rises.
Recall that solubility changes with temperature depend on the enthalpy change (ΔH) of the dissolution process: if dissolution is exothermic (releases heat), solubility decreases with increasing temperature; if endothermic (absorbs heat), solubility increases.
Identify the compounds given: NaCl, Ce2(SO4)3, KNO3, and NH4Cl, and consider their typical solubility behavior with temperature.
Note that KNO3 and NaCl generally become more soluble as temperature increases, while NH4Cl also tends to increase in solubility with temperature due to its endothermic dissolution.
Recognize that Ce2(SO4)3 is known to have an exothermic dissolution process, so its solubility decreases as temperature increases, making it the correct answer.
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