Why does sugar dissolve in water
Sugar has the propensity to dissolve readily in water. When sugar is poured in water, the sugar molecules split as the water molecules pull them away from each other, binding them to sugar molecules. Sugar molecules have hydroxyl groups that have a marginally negative charge. Also, the oxygen with positive charge in water attaches itself to the sugar, forming a shield that guards itself away from other sugar molecules. This is the reason why sugar does not clump itself together, once mixed in water.
There are also chances when sugar may not dissolve totally in water. There are two reasons for this: the solution may not be stirred properly or the water was too cold before the sugar was mixed into it. So if you want to get sugar properly dissolved in water, make sure you stir it properly with a spoon. When you do so, the molecules inside the glass begin to move around in circles. When the water molecules collide with sugar, it splits u and attaches itself to water molecules. As a result, the water molecules begin to fan out making place for sugar molecules. In case, you do not stir the solution properly, the sugar molecules will have the tendency to settle down at the bottom. But eventually, the sugar molecules do get dissolved.
In case you want sugar to dissolve even more quickly in water, heat has to be supplied. As in the law of thermodynamics, applying heat energy to any state of matte can increase the movement of molecules. So, if heat is applied to the solution, the movement of molecules within the solution is quickened. Due to this process, the water molecules are expanded to a greater extent to make room for sugar to mix with them.
It is not sucrose or table sugar that dissolves easily; other forms of sugar like fructose and glucose also mix easily. Heat also makes them react positively as it does to table sugar. So, we can conclude that all forms of sugar are water soluble substances.