Do all solutes show an increase in solubility with increasing temperature? Explain.

No. Carbon dioxide in water comes to mind as an example. Water holds the most CO2 in solution just above the freezing point.

MOST gases are more soluble in cold water than in warm/hot water. Ca(C2H3O2) is one solid that is more soluble in cold water.

Not all solutes show an increase in solubility with increasing temperature. The solubility of a solute depends on various factors such as the nature of the solute, the nature of the solvent, and the intermolecular interactions between them.

There are three common categories for how solubility changes with temperature:

1. Solubility increases with temperature: In some cases, the solubility of a solute increases as the temperature rises. This is true for many solid solutes in liquid solvents. The increased kinetic energy at higher temperatures can overcome the intermolecular forces holding the solute particles together, causing them to dissolve more readily. For example, dissolving sugar in water or salt in water shows an increase in solubility with increasing temperature.

2. Solubility decreases with temperature: In certain situations, the solubility of a solute decreases as the temperature increases. This is often observed with gases dissolved in liquids. As the temperature rises, gas molecules gain more kinetic energy and become more energetic, leading to weaker attractions with the solvent molecules. This causes the gas to come out of solution. For instance, the solubility of gases like oxygen or carbon dioxide in water decreases as temperature increases.

3. Solubility is relatively unaffected by temperature: Some solutes show little to no change in solubility with temperature. This is typically observed with solutes where the intermolecular forces between the solute and the solvent are not significantly influenced by temperature. An example is the solubility of sodium chloride in water, which remains relatively constant regardless of temperature.

To determine the solubility of a particular solute at different temperatures, experimental data or solubility tables can be used. These references provide information about the solubility of specific substances under varying conditions, including temperature.