Friday, May 14, 2010

How Temperature, Pressure and Surface Area affects the dissolving process.

Chemistry Standard 6c. Students know temperature, pressure and surface area affect the dissolving process.

There are three main factors that change the solubility of a solution are Temperature, Pressure and Surface Area. Usually when a substance cannot dissolve all of the particles, then it has become saturated. By implementing the three factors, you will be able to change the rate of dissolving a substance, and you will also change the amount of solute that can be dissolved.
The Temperature's effect on the dissolving process is clear. Heat allows for the solute to be dissolved quicker, and also increases the solubility of the solvent.
Pressure, causes the solute to be increased in the solvent, because the pressure forces the remaining gases into the solute. Therefore, pressure increases the solubility, and also changes the reaction rate.
Finally, the surface area exposed to the solvent determines the rate of which a solute will dissolve. For example, a large crystal of salt will not dissolve as quickly as powdered salt, because the powdered salt has more surface area exposed, speeding up the reaction time.

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