Beer's Law Lab

By: Jenna Osbeck

Background Information

Before starting the lab, you need to make sure that you have a colorimeter hooked up to your computer. Then open up a program called Logger Pro. You will need to make sure that you have your solutions mixed ahead of time as well, and the instructions on how to do that will be given below.

How to Make a Solution

In this experiment, you will be making 7 different solutions. The green substance is the solute, and the water is the solvent. The first solution will be 0%-- which is just water. The second is 10%, the third is 20% and so on up to 60%. To correctly form these solutions, you need to put a total of 10 mL in a beaker. You will then put however much of each solute and solvent in the beaker you need, for example: if you are going to be making a 20% solution, you need to put 2 mL of the green solute plus 8 mL of water (solvent) in the beaker. You will then put each solution into a different cuvette until it is about 3/4 full.

Scientific Explanations for the Observations

Throughout this experiment, I noticed that the more concentrated the solution was, the more the solution absorbed the light. This is because the more dense a solution is, the harder it is for the light to pass through.