This phenomenon is called freezing point depression. Molecules in hot water have a higher kinetic energy than cold water. We all know from our chemistry classes that ionic compounds dissolve easily in water. Place one teaspoon of fine salt in the first container. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. If the existing water molecules do not accommodate salt any more, then no more salt continues to dissolve. The coloring will still diffuse, but it won't sink because the saltwater has a higher specific gravity. The illustration below shows how the different molecules are arranged in the container. Making the solute dissolve faster The water is a liquid and its particle atraction is the highest betwen gas and solids, and plasma, but plasma is a diffrent story, but simce solids have a less particle attraction it melts in the water. This solution is called a saturated solution. Salt dissolves in water. When the solvent is warmed, the tiny particles it is made of move faster. The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. Salt mixed with ice creates a brine that has a temperature lower than 32 F; When salt is added to ice water, it lowers melting temperature of ice down to 0 F or so; Brine is so cold that it easily freezes the ice cream mixture. Salt is an example of a solute that changes a little when the temperature of water rises. Different types of salt … Salt only helps if there is a little bit of liquid water available. The diffusion will be much slower in the cold water. Does the size of the pieces affect how quickly they mix with the liquid? Discussion: Salt would dissolve quicker in hot water because the molecules in hot water move faster than cold water because of the higher energy, therefore the molecules of hot water move fast, they can more easily break apart the other molecules of a different substance when they come into contact. For this experiment you will need: fine and coarse table salt 2 clear containers teaspoon tap water stop watch or cell phone Method: Place 250 ml of water in each container. Why does stirring help to dissolve sugar faster in water? Salt melts ice and helps keep water from re-freezing by lowering the freezing point of water. Why more solute will dissolve in warm solvents? why does salt lower the freezing point of water? When salt is added to the ice bath (usually rock salt in ice cream making), it comes into contact with the thin layer of water on the surface of the melting ice. Why do you think sugar dissolves better in hot water than in cold water? Try dissolving half a spoonful of salt in water and then drop the food coloring. When you dissolve sugar or salt in a liquid-say, water-what happens is that the sugar molecules move to fit themselves between the molecules of water within a glass or beaker. The salt dissolves and the water becomes salty. If you simply drop a lump of sugar in a glass filled with water, the dissolution will be notably slower, as water molecules can only come in contact with the particles on the surface. Investigation: Does coarse salt dissolve faster or slower than fine salt? The salt has to dissolve into its ions in order to work. Temperature is basically a measure of the average kinetic energy of molecules of a substance. Why does salt dissolve in water? This increases the spaces between them so that there is room for more solute to dissolve. The faster the water molecules move around, the faster and easier that they can surround the salt molecules, thus causing the salt to dissolve in the water. 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