Final answer:
The statement that NaCl is more soluble at lower temperatures is false; NaCl's solubility slightly increases with temperature.
Step-by-step explanation:
The student asked whether it is true that NaCl (sodium chloride) is more soluble at lower temperatures than at higher temperatures. The answer to this question is false. The solubility of NaCl is not substantially affected by temperature changes; the relationship between temperature and solubility for NaCl is considerably flat. This means changes in temperature only slightly affect the solubility of NaCl. In fact, its solubility is about 36.0 g per 100 g water at 20°C. While some solutes have solubility that dramatically increases with temperature, like KNO3 (potassium nitrate), the solubility of NaCl only changes slightly, and typically, NaCl’s solubility increases somewhat as the temperature rises.