The rate at which sugar dissolves in a solvent is directly proportional to the agitation in the dissolving environment. Agitation can be easily produced by stirring the solution. Stirring increases the movement of sugar and solvent molecules and they collide more. The increased collisions of the molecules increase the rate of dissolution. /////////////////This fact is also supported by the collision theory.
The rate of dissolution of sugar is directly proportional to the temperature of the dissolving solution or environment. An increase in temperature increases the movement and energy of the sugar and solvent molecules, decreasing the activation energy of the chemical reaction and increasing the overall rate of the reaction.
The size and the surface area of the sugar particles also affect the rate of dissolution. When the particles are smaller, the total surface area of the sugar is larger and so the rate of dissolution is higher. An increase in the surface area of the reactants, i.e., sugar and solvent, increases the rate of the chemical reaction. Powdered sugar dissolves more quickly than a lump of sugar.
There can be other factors, such as the type of solvent and viscosity of the solvent, that can affect the rate of dissolution of sugar. The more viscous the solvent is, the lower the dissolution rate will be. Sugar will be dissolved more quickly in a polar solvent such as water than in non-polar solvents because of polar sugar molecules. Further, the pressure of the dissolving environment can have some effect on the dissolution process.