NaCl, or sodium chloride, is known to be more soluble in water at higher temperatures. Therefore, at 90 degrees Celsius, NaCl has a greater solubility compared to its solubility at 0 degrees Celsius.
This increase in solubility is due to the increased kinetic energy of water molecules at higher temperatures. As the temperature rises, water molecules move faster, allowing them to more effectively interact with and separate the NaCl ions from the crystalline structure, thus dissolving it more readily.