Henrys Law  

An important calculation in chemistry and one that you are indirectly familiar with  is Henrys Law.  This can be called the carbonated beverage law. In making carbonated beverages, CO2 is dissolved under pressure into the beverage. CO2 is used as a preservative.  In order to determine solubility using Henrys Law, two pieces of information are required.  One of these is the pressure used to force the gas into solution.  Pressure in chemistry can be given in several forms and you need to know the difference between them. In this particular case, the pressure is in atmospheres. Sometimes pressure is given in millimeters of Mercury. When you listen to the weather, you are given the atmospheric pressure or barometric pressure in mm of Hg. Another means of measuring pressure is in units called kiloPascals. The three forms are equivalent.  

1 atmosphere = 760 mm of Hg = 101.3 kiloPascals.   Remember these numbers!

Solubility refers to the amount of a solute that will dissolve in a certain amount of solvent at a certain temperature. Different substances dissolve at different rates depending upon the temperature. Some substances do not dissolve hardly at all in certain solvents.
