Density Lab Group Members: Bianca Hernandez, Felicity Do, Ana Ruiz, and Kayla Bordley Class: 115 Date Performed: 9/26/14 Date Due: 10/2/14 1.) Intro: a.) Purpose- The purpose of the lab is to discover how to measure the mass and volume of liquid and solid samples, such as water, olive oil, vegetable oil, and other solid samples, as well as using the correct number of significant figures and determining how to calculate and find the density and specific gravity of each of the substances. b.) Equipment- i.) Electronic balance- An electronic balance is used to find the mass of an object. To use the electronic balance, hold the reset button to set it to zero and afterwards gently place the object/sample on the plate to calculate the mass. …show more content…
iii.) Pipet- A pipet was used to contain and hold liquid to measure the mass by placing it on the electronic balance, as well as transport the liquids into graduated cylinders. c.) Technique- i.) Water Displacement Technique- To execute the water displacement technique, a graduated cylinder must first be filled with water up until a certain point (in one case in this experiment, up until the 25.0 milliliter mark on a 50 milliliter graduated cylinder) and measured for its volume. Afterwards, place the solid sample in the graduated cylinder and measure the volume once more. Finally, subtract the volumes of both the water only and the water with the solid and the result will be the volume of the solid. ii.) Filling a pipet- To fill a pipet, first squeeze and hold the top of the pipet until the tip is under the liquid substance. Release the hold at the top to fill the pipet and invert the pipet. Squeeze the top once more, releasing the accumulated air that was left over. While still holding the top, invert the pipet once more and place it under the liquid. Release the hold, and the pipet should be filled up completely with the liquid. 2.) Data …show more content…
Such techniques include water displacement and correctly filling pipets. Specific equipment was introduced in this experiment as well, such as an electronic balance and a graduated cylinder. After executing the experiment, a percent error of 4.90% had resulted from one of the liquid samples. Having reviewed the work that resulted in the calculation, it is very likely that a mistake had occurred during experimentation or the aftermath where calculations took place. In conclusion, the purpose of the lab had indeed followed through and resulted in a percent error of only