Beers Law Lab

By Ally Schleicher

Background Information

Background information is important in every lab. In this lab we had to determine what anesthesia was and how it helped people. We had to use the information given to us in the Pre-Lab reading to determine what Beer's Law is and how to relate it to this particular lab. Beers law is a law that states the quantity of light absorbed by a substance dissolved in a non-absorbing solvent is directly proportional to the concentration of the substance and the path length of light through the solution.(Source 1)

Nitrous Oxide

Nitrous Oxide was found at the end of the 18th century, and is still widely used. This gas is colorless and has no odor. It was first noticed in 1793, and people began to wonder why people who were exposed to this gas started to laugh uncontrollably. Over the next 40 years, it was used in circuses where you would pay money and inhale the gas and act sill for a number of minutes. Lastly, in the early 1840's scientists found a more well known scientific practice to use as a anesthetic in medicine and dentistry.

Pre-Lab Questions

1.) Yes, I have had an experience with anesthesia. I have had to get teeth pulled.

2.) Some characteristics that seem desirable would be being able to be your own boss. You get to decide what the patient needs and how to take care of them.

3.) Some characteristics that don's seem desirable would be the job being dangerous. You need to make sure that you know how much the patient needs without giving them too much of the drug. You would be the person responsible for the drug administering.

Absorbence Rate

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Post-Lab Questions

1.) The concentration of Aunt Elda's anesthesia was too much. She needed to have her appendix removed. The concentration she was given was .409, which is near 80% concentration. The recommended amount is 40% concentration, or .223. She was given almost double the recommended amount.

2.) Yes, the amount of concentration of the anesthesia was almost double the recommended amount.

3.) Beer's Law helped me with this lab because it helped to see the amount of light that penetrated through Aunt Elda's anesthesia solution.

Finding Percent Solutions

First you have to know some terms before you can determine the percent solution.

Solute: the substance which dissolves in a solution.

Solvent: the substance which dissolves another to form a solution.

Solution: a mixture of two or more pure substances.

First you have to decide how much solution you want. In class, we made a 10 mL solution with green food coloring. Next, you have to decide what you want the percent solution to be. My group dealt with a 40% solution. What you have to do is decide whatever your amount is (40%) and take that and divide by 10 (10/4). Take 10-4 and you get 6. You take the solvent and fill the graduated cylinder until you get 6 mL (in this case, the water). Then to finish, you take the solute and fill it the rest of the way until it hits the 10 mL mark (the green dye).