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Solubility curves depict the relationship between temperature and the solubility of a substance in a solvent. Here are two key uses:
1. Predicting Solubility: By knowing the temperature and the solubility curve for a specific solute-solvent pair, one can predict the maximum amount of solute that will dissolve at that temperature.
2. Crystallization: Solubility curves help in determining the optimal temperature conditions for crystallization. By carefully cooling a saturated solution, the excess solute can be induced to crystallize out, achieving purification and separation.