To determine which chemical compound exhibits lower solubility at 50°C compared to 20°C, we would need to analyze the trend of solubility for each solute at the specified temperatures according to the graph.
From general knowledge regarding solubility trends:
- KNO3 (Potassium Nitrate): Typically, KNO3's solubility increases with temperature.
- Ce2(SO4)3 (Cerium(III) Sulfate): The behavior may vary, but it often has increasing solubility with temperature.
- KCl (Potassium Chloride): Generally shows increasing solubility with rising temperature.
- NaCl (Sodium Chloride): While it dissolves better at higher temperatures, the difference isn't as pronounced as with some other salts.
Based on common solubility trends, none of the compounds are expected to exhibit lower solubility at a higher temperature compared to a lower temperature. However, if the graph shows an exception for any specific substances, please refer back to the graph.
If you can provide specific solubility values or clearer references from the graph, this can help pinpoint the correct answer. Otherwise, solubility trends generally indicate that solubility increases for most salts as you raise the temperature.
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