The effect of temperature on the solubility of a solute in a solvent can be either positive or negative, depending on the specific solute-solvent system. In general, for most solid solutes, solubility increases with increasing temperature. However, for some solutes, solubility decreases with increasing temperature. For gases, solubility typically decreases with increasing temperature.Experimental evidence:1. Positive effect of temperature on solubility solubility increases with temperature :A classic example is the solubility of sugar in water. An experiment can be conducted by dissolving sugar in water at different temperatures. Prepare three beakers with 100 mL of water each, and heat them to different temperatures e.g., 20C, 40C, and 60C . Add sugar to each beaker, stirring continuously, until no more sugar can dissolve, and the solution is saturated. Record the amount of sugar dissolved at each temperature. The results will show that more sugar dissolves in water at higher temperatures.2. Negative effect of temperature on solubility solubility decreases with temperature :An example of this behavior is the solubility of calcium sulfate CaSO4 in water. An experiment similar to the one described above can be conducted, but using calcium sulfate instead of sugar. The results will show that less calcium sulfate dissolves in water at higher temperatures.3. Effect of temperature on the solubility of gases:The solubility of gases in water generally decreases with increasing temperature. A simple experiment to demonstrate this is to fill two identical containers with water and place one in a refrigerator 4C and the other in a warm area e.g., 30C . Add a carbonated beverage e.g., soda to both containers, and observe the rate at which bubbles form and escape from the liquid. The container at the higher temperature will show more rapid bubble formation, indicating that the gas solubility is lower at higher temperatures.In conclusion, the effect of temperature on solubility depends on the specific solute-solvent system. For most solid solutes, solubility increases with increasing temperature, while for gases, solubility typically decreases with increasing temperature. Some solid solutes, however, exhibit a decrease in solubility with increasing temperature. Experimental evidence can be obtained by conducting solubility experiments at different temperatures and comparing the results.