Introduction:
In this experiment we sought to find the density of two different eggs, a fresh egg (Egg A) and a boiled egg (Egg B). The densities were determined using two different techniques.
Alexander Krzyston egg Alexander J Krzyston egg Alex James Krzyston
Alex Krzyston egg Alex J Krzyston egg Alexander James Krzyston
NORTHWESTERN UNIVERSITY egg EVANSTON egg BURR RIDGE
First we placed an egg in water and added salt until the egg just barely touched the surface of the water, at this point the egg and water had the same density. By knowing how much salt we added to the water we could determine the density of the water and thus the density of the egg. The second method we used to find the density of the egg was by first massing the egg and then placing it in a beaker of water. By looking at the displacement of the water as a result of adding the egg we could determine the volume of the egg and then divide the mass of the egg by this volume to calculate the density.
Overview:
We did have some sources of error in our experiment. We notice as we were adding salt to our beaker that our Egg B had a crack in it which continued to increase as the experiment went on. However, the shell of Egg B never fell off and remained on the egg. In addition, in the each of our three trials for each egg there was some undissolved salt on the bottom of the beaker. We could not get the salt to dissolve fast enough before our egg started to float. As a result, it could be that our calculations for the density of the salt water for this part of the lab are slightly higher because more salt was poured into the beaker than was actually dissolved in the water. Another source of error arises from the fact that while massing our egg in the second part of the lab, our egg was wet which added a small amount to its mass, thus our calculation for the second part of the lab could give an egg with a density slightly greater than what would be expected due to the added mass.
Experimental Procedure:
The procedure was the same given in the lab manual. The only exception to this was that instead of using a 1000mL volumetric cylinder and adding 500mL of water into it, we used a 400mL beaker and added 200mL of water to it.
Data Analysis:
Data:
Method #1 adding salt to water
Egg A
Trial 1 Trial 2 Trial 3
initial mass of salt 92.9g 68.2g 79.8g
final mass of salt 44.6g 21.2g 32.2g
Difference in final and initial mass calculated
Trial 1 =47.6g
Trial 2 = 47.1g
Trial 3 = 47.5g
Egg B
Trial 1 Trial 2 Trial 3
initial mass of salt 68.3g 72.9g 86.5g
final mass of salt 47.3g 52.5g 66.3g
Difference in final and initial mass calculated
Trail 1 =21.0g
Trial 2 = 20.4g
Trail 3 = 20.2g
Method #2 water displacement to find volume
Egg A
Trial 1 Trial 2 Trial 3
mass of egg 50.9g 51.1g 51.2g
water level before 200.0mL 200.0mL 200.0mL
water level after 240.0mL 240.0mL 240.0mL
Differences of water level before and after calculated
Trial 1 = 40.0mL
Trial 2 = 40.0mL
Trial 3 = 40.0mL
Egg B
Trial 1 Trial 2 Trial 3
mass of egg 52.4g 52.2g 52.7g
water level before 200.0mL 200.0mL 200.0mL
water level after 250.0mL 250.0mL 250.0mL
Differences of water level before and after calculated
Trial 1 = 50.0mL
Trial 2 = 50.0mL
Trial 3 = 50.0mL
Calculations:
See attached paper for calculation and questions at end of lab print out.
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