For the Measurement Lab, I am experimenting with different measuring equipment. The purpose of this lab is to determine which piece of equipment has the most accuracy and precision. By doing so, I am also determining what purposes each equipment has for different measurements.
I chose this lab mostly because I wanted to get my hands on the equipment that I saw lying on the shelves. I wanted to finally see how they are used. I was also hoping to gain valuable experience and knowledge of the equipment for future labs that I might do.
The two most important terms, to understand for this lab, is Accuracy and Precision. Accuracy shows correctness or how close a measurement is to the true value. Precision shows if measurements can be reproduced or how close they are to one another.
I chose this lab mostly because I wanted to get my hands on the equipment that I saw lying on the shelves. I wanted to finally see how they are used. I was also hoping to gain valuable experience and knowledge of the equipment for future labs that I might do.
The two most important terms, to understand for this lab, is Accuracy and Precision. Accuracy shows correctness or how close a measurement is to the true value. Precision shows if measurements can be reproduced or how close they are to one another.
- Volumetric Flask Percent Error = 0.66%
- Beaker Percent Error = 4.81%
- Graduated Cylinder Percent Error = 1.75%
- Erlenmeyer Flask Percent Error = 1.15%
- Pipette Percent Error = 0.09%
After calculating the R-Squared values, I can determine that the Volumetric Flask had the highest R-Squared value. It had an R-Squared value of 1, which was the highest of the equipments that I used. Since it had the highest R-Squared value, it is the most precise equipment for measurement.
I believe that based on my measurements, the Volumetric Flask would provide the best overall measurements. It was the most precise equipment because it had the highest R-Squared value of 1. It was also the second most accurate equipment after the Pipette. This was because it had the second lowest percent error of 0.66%.
I thought that I preformed decently on this lab. However I thought that when I filled the equipment up with water, the water could have been closer to the scale marks. The sink I used did not produce a good stream of water, so it gave me trouble putting the water at the intended marks. I believe that this contributed to most of the errors and inconsistencies in my measurements.
Here is a download for the Excel file I used to record all of my measurements and calculations.
measurement_lab_(10th_grade_chemistry).xlsx |