One useful and often used way of determining the concentration of a chemical in a solution, if it has a color, is to measure the intensity of the color and relate the intensity of the color to the concentration of the solution. Several useful factors are very important. After discussing those important factors and the mathematical summary of them called Beer's Law, we will look at colorimeters, the instruments that you will use to measure color intensity.
Next we will deal with the problem of actually figuring out the concentration of a solution from the absorbance measurements that can be made using the colorimeters by looking at Calculations for Colorimetry. There are three methods that can be used depending on what information is available. They involve using proportionality, graphing and Beer's Law.
Your Lab Work for this lesson will involve puting all of that together when you experimentally determine the concentration of an unknown solution.
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Clackamas Community College