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Accuracy and Precision Lab Report

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Introduction

Lab Report: Accuracy and Precision Summary: In this experiment, we recorded the smallest unit of measurement for a ruler, two graduated cylinders, and a scale on a balance. We evaluated the measurement of volume, length, mass, and temperature. Next, we measured the temperature of water. We then found the mass and volume of water, as well as the mass and volume of the unknown metal. By subtracting volumes, we found the density of the metal, and compared it to densities of other common metals until we found the density that best matched out metal. Data: Table 1 Table 2 Table 3 Table 4 Table 5 Analysis and Interpretation: 1.) Uncertainty Figures: Ruler: Height of 50mL mark on graduated cylinder: (� 0.1cm / 9.5cm) * 100 = � 1.053% Inside width of graduated cylinder: (� 0.1cm / 2.5cm) ...read more.

Middle

Mass of water is determined by subtracting the mass of the 25mL cylinder from the measured mass of the 25mL cylinder and water, or: 65.1g - 50.8g = 14.3g The mass of the water according to the density formula is D = M / V, or 0.997569= m / 16mL, or 15.961g. The experimental error looks like this: (14.3g - 15.961g) / (14.3g) * 100 = 11.6% error. 5.) The volume of the metal is obtained by subtracting the volume of the water from the combined volume of the water and the metal. 23mL - 16mL = 7mL volume for the metal. The mass of the metal is attained by subtracting the mass of the cylinder and water from the mass of the cylinder, water, and metal. ...read more.

Conclusion

The class average is 8.54 g/mL. This value comes closest to the density of nickel. Our group's density come closest to that of antimony. 8.) The percent error of our density: (8.9 - 8) / (8.9) * 100 = 11.25% error The percent error for the class' density (8.9 - 8.54) / (8.9) * 100 = 4.04% error. The class average density has a much lower percent error than our own group's. Extensions: 1.) Marie and Jason were precise with their measurements, but not accurate. Their average density was 2.83g/mL. Their experimental error was such: (2.4 - 2.83) / (2.4) * 100 = 17.9% error. Their uncertainty was such: (�0.01 / 2.83) * 100 = 0.353% uncertainty. 2.) When cutting legs off a table, precision is always better than accuracy. When precise, the same amount from each table leg will be cut, keeping the table even. The accuracy, though, can only be determined if the measurement is already know. Zachary May 9-4-01 5th ...read more.

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