Experiment 1
Density
By
Jessica Schmidt
Chem 112L-S23- Athukoralage Gunawardana
September 20, 2016
Erin Whitehouse
The first part of the experiment consisted of finding the accuracy and precision of three different measuring devices, a 50mL beaker, a 25mL graduated cylinder and a 25mL pipette. The mean volumes and uncertainties were found to be 22.5mL 1.9, 23.72 .25, and 24.89 .43, respectfully. The 25mL pipette was found to be the most accurate out of the three. The density of water was found to be 0.9979 g/cc with a percent error of .08, while the known density of water being 0.997041 g/cc. For the second experiment, the mean found density of copper was 8.7g/cc .22 and the known density for copper is 8.92 g/cc with a percent error of 2.13%. Sources of error could be incorrect measuring or approximating of the water in the cylinder which could result in incorrect data, thus producing an incorrect density. Procedure: Hark, R. (2015). Chemistry 112L (9th ed.). Minneapolis, MN: Bluedoor, LLC. Mass Mass of Water Temp Density g/cc V/ mL Beaker 52.351 23.4480 21.1943 0.9980 23.4960 50.534 21.6310 21.2060 0.9980 21.6754 51.185 22.2820 21.2236 0.9979 22.3278 Mean Volume 22.5 Uncertainty 1.9 Cylinder 52.482 23.5790 21.1548 0.9980 23.6271 52.54 23.6370 21.3801 0.9979 23.6864 52.709 23.8060 21.4693 0.9979 23.8562 Mean Volume 23.72 Uncertainty 0.25 Pipette 53.804 24.9010 21.5891 0.9979 24.9542 53.513 24.6100 21.4634 0.9979 24.6619 53.91 25.0070 21.2104 0.9980 25.0583 Mean Volume 24.89 Uncertainty 0.43 Trial 1 Trial 2 Trial 3 Mass dry cylinder/g 27.315 27.314 27.318 Mass dry cylinder + metal /g 60.222 60.22 60.224 Mass dry cylinder + metal + water/g 66.384 66.453 66.471 Mass metal/g 32.907 32.906 32.906 Mass water/g 6.162 6.233 6.247 Volume water/cc 6.1760 6.2472 6.2613 Volume metal/cc 3.8239 3.7528 3.7387 Density metal/ g/cc 8.6056 8.7685 8.8014 Mean density ± Uncertainty / g/cc 8.73 ± .22 • Density= = (1) In this equation, m is the mass of the substance while v stands for the volume of the substance. The units of density are grams (g) over milliliters (mL) or grams (g) over cubic centimeters (cc) • d(g/cc) = (2) In this equation, d stands …show more content…
25mL of water was measured out using a 50mL beaker, a 25mL graduated cylinder and a 25mL pipette. The temperature of the water was recorded then the water was poured into a different beaker to be placed on the scale and its mass recorded. This process was repeated three times for each container type. For the second part of the experiment, a dry graduated cylinder was weighed, then copper pellets was added and together were weighed and their masses recorded. The cylinder containing the metal was then filled with water and the mass was taken again. These measurements were then used to find the individual masses and volumes of the water and …show more content…
The beaker was found to be both the least accurate, the least precise and had the largest uncertainty of the three measuring devices with an accuracy of 89.96, a precision of 8.44 and a percent error of 10.04 1.9. The graduated cylinder was the second most accurate and precise with its accuracy of 94.88, a precision of 1.05 and a percent error of 5.12. The 25mL pipette was found to be the most accurate and precise measuring device with an accuracy of 99.56, a precision of 1.72 and a percent error of
Density
By
Jessica Schmidt
Chem 112L-S23- Athukoralage Gunawardana
September 20, 2016
Erin Whitehouse
The first part of the experiment consisted of finding the accuracy and precision of three different measuring devices, a 50mL beaker, a 25mL graduated cylinder and a 25mL pipette. The mean volumes and uncertainties were found to be 22.5mL 1.9, 23.72 .25, and 24.89 .43, respectfully. The 25mL pipette was found to be the most accurate out of the three. The density of water was found to be 0.9979 g/cc with a percent error of .08, while the known density of water being 0.997041 g/cc. For the second experiment, the mean found density of copper was 8.7g/cc .22 and the known density for copper is 8.92 g/cc with a percent error of 2.13%. Sources of error could be incorrect measuring or approximating of the water in the cylinder which could result in incorrect data, thus producing an incorrect density. Procedure: Hark, R. (2015). Chemistry 112L (9th ed.). Minneapolis, MN: Bluedoor, LLC. Mass Mass of Water Temp Density g/cc V/ mL Beaker 52.351 23.4480 21.1943 0.9980 23.4960 50.534 21.6310 21.2060 0.9980 21.6754 51.185 22.2820 21.2236 0.9979 22.3278 Mean Volume 22.5 Uncertainty 1.9 Cylinder 52.482 23.5790 21.1548 0.9980 23.6271 52.54 23.6370 21.3801 0.9979 23.6864 52.709 23.8060 21.4693 0.9979 23.8562 Mean Volume 23.72 Uncertainty 0.25 Pipette 53.804 24.9010 21.5891 0.9979 24.9542 53.513 24.6100 21.4634 0.9979 24.6619 53.91 25.0070 21.2104 0.9980 25.0583 Mean Volume 24.89 Uncertainty 0.43 Trial 1 Trial 2 Trial 3 Mass dry cylinder/g 27.315 27.314 27.318 Mass dry cylinder + metal /g 60.222 60.22 60.224 Mass dry cylinder + metal + water/g 66.384 66.453 66.471 Mass metal/g 32.907 32.906 32.906 Mass water/g 6.162 6.233 6.247 Volume water/cc 6.1760 6.2472 6.2613 Volume metal/cc 3.8239 3.7528 3.7387 Density metal/ g/cc 8.6056 8.7685 8.8014 Mean density ± Uncertainty / g/cc 8.73 ± .22 • Density= = (1) In this equation, m is the mass of the substance while v stands for the volume of the substance. The units of density are grams (g) over milliliters (mL) or grams (g) over cubic centimeters (cc) • d(g/cc) = (2) In this equation, d stands …show more content…
25mL of water was measured out using a 50mL beaker, a 25mL graduated cylinder and a 25mL pipette. The temperature of the water was recorded then the water was poured into a different beaker to be placed on the scale and its mass recorded. This process was repeated three times for each container type. For the second part of the experiment, a dry graduated cylinder was weighed, then copper pellets was added and together were weighed and their masses recorded. The cylinder containing the metal was then filled with water and the mass was taken again. These measurements were then used to find the individual masses and volumes of the water and …show more content…
The beaker was found to be both the least accurate, the least precise and had the largest uncertainty of the three measuring devices with an accuracy of 89.96, a precision of 8.44 and a percent error of 10.04 1.9. The graduated cylinder was the second most accurate and precise with its accuracy of 94.88, a precision of 1.05 and a percent error of 5.12. The 25mL pipette was found to be the most accurate and precise measuring device with an accuracy of 99.56, a precision of 1.72 and a percent error of