When the sugar crystals are dissolving at exactly the same rate that sugar is crystallizing out of solution, a system is at equilibrium. With bigger gaps between the molecules in the hot water, more sugar molecules can fit in between. ... both in the solid and the water. Dissolving a solid requires energy input to disrupt the forces holding the molecules together, both in the solid and the water. Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form intermolecular bonds with the polar water molecules. The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. A sugar cube is tightly compacted granulated sugar, meaning it … The weak bonds that form between the solute and the solvent compensate for the energy needed to disrupt the structure of both the pure solute and the solvent. > The reason why sugar dissolves at a faster rate in hot water has to dowith increased molecular motion. ... A solvent is a substance that can dissolve other substances – water is a good solvent. Why Does Sugar Dissolve Faster In Hot Water Than In Cold Water? You can stir in more sugar in the water if it is hotter. The balance between dissolution and crystallization can be changed by changing the temperature of the solution. Anonymous answered . The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. Why is hot water a better solvent than cold water? 1. If you dissolve the maximum amount of sugar in hot water, some of the sugar will come out of solution when the water cools off. When water is heated, the molecules gain energy and, thus, move faster. Another name for the liquids inside the cups is a 'solution', when this solution can no longer dissolve sugar it becomes a 'saturated solution', this means that sugar starts forming on the bottom of the cup. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. The cold water isn't able to dissolve as much sugar as the hot water, but why? This added movement tends to make the bonds between sucrose molecules easier to overcome. The solubility of sugar in water is higher for hot water than for cold water. i think its because the hot water molecules are moving faster- farther apart- than cold water -slow moving - molecules. Sugar dissolves faster in something hot than it does in something cold is because when particles are heated, they move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster. The water molecules are more agitated and there is more motion inside the liquid and hence the sugar molecules get spread out far more quickly than in cold water. the sugar has more space to dissolve into the spaces between the molecules in hot water than cold. 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