Does sugar decrease the temperature of hot boiling water?

Adding sugar to hot boiling water does not decrease its temperature. Instead, it increases the boiling point of the water. This phenomenon is known as boiling point elevation. When a solute, such as sugar, is dissolved in a liquid, it raises the boiling point of the liquid. This is because the solute particles compete with the water molecules for space at the liquid's surface. This competition makes it more difficult for the water molecules to escape into the air, which raises the boiling point of the water.

The boiling point elevation caused by sugar is directly proportional to the concentration of sugar in the water. The more sugar that is dissolved in the water, the higher the boiling point will be. However, the boiling point elevation caused by sugar is relatively small compared to the boiling point elevation caused by other solutes, such as salt. For example, adding one teaspoon of sugar to one cup of water will raise the boiling point by about 0.5 degrees Celsius, while adding one teaspoon of salt to one cup of water will raise the boiling point by about 2 degrees Celsius.