How does stirring affect the rate of dissolving

The packet of granulated sugar exposes far more surface area to the solvent and dissolves more quickly than the sugar cube. Dissolving sugar in water will occur more quickly if the water is stirred. The stirring allows fresh solvent molecules to continually be in contact with the solute. If it is not stirred, then the water right at the surface of the solute becomes saturated with dissolved sugar molecules, meaning that it is more difficult for additional solute to dissolve.

The sugar cube would eventually dissolve because random motions of the water molecules would bring enough fresh solvent into contact with the sugar, but the process would take much longer. It is important to realize that neither stirring nor breaking up a solute affect the overall amount of solute that dissolves.

It only affects the rate of dissolving. Heating up the solvent gives the molecules more kinetic energy. The more rapid motion means that the solvent molecules collide with the solute with greater frequency and the collisions occur with more force. Both factors increase the rate at which the solute dissolves.

As we will see in the next section, a temperature change not only affects the rate of dissolving, but also affects the amount of solute that dissolves. Watch the video at the link below and answer the following questions:. But eventually it would dissolve. The reason it dissolves fast when stirred as apposed to letting it set is the tea at the bottom is already saturated with as much sugar as it can hold.

When the total surface area of the solute particles is increased, the solute dissolves more rapidly. Stirring — With liquid and solid solutes, stirring brings fresh portions of the solvent in contact with the solute.

Stirring, therefore, allows the solute to dissolve faster. The rate of dissolving depends on the surface area solute in solid state , temperature and amount of stirring. A: The rate of dissolving is influenced by several factors, including stirring, temperature of solvent, and size of solute particles. Three ways I can come up with are increasing the temperature, increased the amount of solvent, and using a solvent with similar polarity as the solute.

For example, water is a polar solvent and it will dissolve salts and other polar molecules, but not non-polar molecules like oil. Example : HCl in water. If the solvent is non-polar then the non-polar substances only can be dissolved in it. Example : hexane in benzene. If the solubility constants is greater than one, the substance is at least partly soluble. The bigger it is, the more soluble it is.

Here you have to consider whether that molecule is polar or non polar. Insoluble salts are ionic compounds that are insoluble in water: the salt continues to exist as a solid rather than dissolving in the liquid. When a salt such as sodium chloride table salt dissolves in water, its ionic lattice is pulled apart so that the individual sodium and chloride ions go into solution. Sugar can dissolve easier than salt because when you add 8 spoons of salt into water the salt already starts to stay in the bottom of the cup.

Chemistry Solutions Solution Formation. Doc Croc. Jun 9, Related questions How can temperature affect the formation of a solution? How can the formation of a solution be exothermic or endothermic? How does the formation of a solution involve energy?

How do you find heat of formation of a solution?