How does increasing temperature typically affect the solubility of most solids in liquids?

How does increasing temperature typically affect the solubility of most solids in liquids?

• A. Solubility decreases with higher temperature.
• B. Solubility is unaffected by temperature.
• C. Solubility varies unpredictably with temperature.
• D. Solubility increases with higher temperature.

Answer: (D)

Increasing temperature typically makes solids dissolve more in liquids because the dissolution process often absorbs heat. When heat is added, the system shifts toward dissolving more solute to use that energy, so more solid can be carried into the solution. This is why substances like sugar or salt can dissolve in water more readily when the water is warm. There are exceptions, though—some solutes dissolve more when cooled if their dissolution is exothermic—so not all solids follow this trend. Also, gases behave differently, generally becoming less soluble as temperature rises.

Increasing temperature typically makes solids dissolve more in liquids because the dissolution process often absorbs heat. When heat is added, the system shifts toward dissolving more solute to use that energy, so more solid can be carried into the solution. This is why substances like sugar or salt can dissolve in water more readily when the water is warm. There are exceptions, though—some solutes dissolve more when cooled if their dissolution is exothermic—so not all solids follow this trend. Also, gases behave differently, generally becoming less soluble as temperature rises.