Chem 14BL - Pipets Experiment Post-Lab

Chem 14BL - Pipets Experiment Post-Lab - water and transfer...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Conclusion After creating a table chart to record the measurements of the experiment, I calculated the true weight of the water in each of the bottles, the volume of the pipet in each trial, and the percent relative standard deviation for the volume delivered by the 10.00 mL pipet. Using the density of air and the density of the water at 21 degrees Celsius, from bottle number one, the true weight of the water was 9.9526 grams and therefore the volume Conclusion (Revised) In the experiment, instead of filling the wash bottle with distilled water, I filled the wash bottle with tap water. After calibration and cleaning of equipment, and the practice of transferring water with the 10.00-mL pipet, I weighed the weighing bottles and recorded the data. However, the weighing bottles I used did not have caps, so I didn’t use caps for any of the 3 weighing bottles. Then, I carefully filled the beaker with 50.00 mL of tap water from the wash bottle, and began using the clean 10.00-mL pipet to fill with this
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: water and transfer to the weighing bottles. I recorded the new weight of the weighing bottles with the water and the temperature of the wash bottle. After careful calculations, I came out with an average volume of 9.96-mL delivered by the pipet to the weighing bottles. The relative average deviation for the volume delivered by the pipet came out to be 0.40%. Because I received a %RAD greater than 0.2%, this means that I have not mastered the use of the pipet as mentioned in the lab manual. However the average volume delivered of 9.96-mL sounds reasonable as mentioned by Professor Pang in lecture. Some of the errors that I might have encountered include not cleaning the pipet and weighing bottles completely, not using the analytical balance properly, and/or not making precise measurements. However, I think that practicing to use the pipet will help me make more precise measurements in later experiments involving the pipet....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern