Final answer:
The solubility curve for sodium chloride (NaCl) is fairly flat, while the solubility curve for potassium nitrate (KNO3) is steep and temperature-dependent.
Step-by-step explanation:
The solubility curve for sodium chloride (NaCl) compared to potassium nitrate (KNO3) shows that the temperature dependence of NaCl is fairly flat, meaning that an increase in temperature has relatively little effect on its solubility. On the other hand, the curve for KNO3 is very steep, indicating that an increase in temperature significantly increases its solubility.