Which statement best describes the general trend of solubility for solids in water as temperature increases?

Which statement best describes the general trend of solubility for solids in water as temperature increases?

• A. Temperature has no effect on solubility
• B. Solubility oscillates randomly with temperature
• C. Solubility generally decreases with temperature
• D. Solubility generally increases with temperature

Answer: (D)

Most solid solutes become more soluble in water as the temperature rises. Dissolving a solid often involves breaking the crystal lattice (an endothermic step) and forming interactions with water. Raising the temperature supplies more thermal energy, which shifts the balance toward more dissolved solute, so the solubility limit increases. This is why substances like sugar or many common salts dissolve better in hot water. There are exceptions where solubility can decrease with temperature, but those are not the general case.

Most solid solutes become more soluble in water as the temperature rises. Dissolving a solid often involves breaking the crystal lattice (an endothermic step) and forming interactions with water. Raising the temperature supplies more thermal energy, which shifts the balance toward more dissolved solute, so the solubility limit increases. This is why substances like sugar or many common salts dissolve better in hot water. There are exceptions where solubility can decrease with temperature, but those are not the general case.