CHEM 1111 Lecture Notes - Lecture 1: Volumetric Flask, Graduated Cylinder, Burette

• School: Boston College
• Department: Chemistry
• Course: CHEM 1111
• Professor: Chia- Kuang Tsung

Document Summary

Calculations: density of the solution for the fresh egg, graduated cylinder. 1. 0804 g/ml: density of the solution for the stale egg, burette. 1. 044 g/ml: the fresh egg is denser than the stale egg, and this answer matches the prediction i had made prior to the experiment. I think the differences in the sizes of the air cells caused such result. As an egg ages, air will draw in through the porous shell and the air cell will increase in size, causing the egg s density to decrease. This makes it easier for us to read the meniscus level exactly and thus causes less human errors. If you fail to control the pressure and dispense too much liquid, you have to draw the liquid again with a pipette controller and repeat the process. This makes it harder for us to read the meniscus level exactly and thus causes more human errors.