By adding salt it means that you are adding an impurity into the water. Impurities can lower the boiling point, while increasing its melting point.
Any added impurity can change the boiling point of a liquid.
The pure ethanol has the boiling point 78.5 celsius while water has 100 celsius so when water is added to ethanol its boiling point becomes increased.
When ethylene glycol is added to water, the boiling point of the resulting solution increases. Ethylene glycol acts as an antifreeze, raising the boiling point and lowering the freezing point of water.
Adding an impurity to boiling water, such as salt, sugar, or other substances, can change the boiling point of the water. The impurity will raise the boiling point of the water, meaning it will need to reach a higher temperature to boil. This effect is known as boiling point elevation.
Ethanol is a better solvent for boiling point elevation compared to water. This is because ethanol has a higher boiling point than water. When a solute is added to ethanol, it will raise the boiling point of the solution more significantly than if the same solute were added to water.
sugar
it cools it
The boiling point of water will increase if gelatin will be added to the water. The reason for this is because gelatin adds to the concentration of the liquid resulting to higher boiling point.
it does not change
The temperature of boiling water remains constant at the boiling point (100°C at sea level) because the added heat energy is used to convert the liquid water into water vapor, rather than increasing the temperature. This phase change absorbs heat without affecting the temperature.
The boiling point of water become 102 oC.
The quantity of salt added to water is under your control and it will change the boiling point of water,i,e. the temperature of water. So quantity of salt is an independent variable while the temperature of water is dependent variable, when other factors are kept constant.