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The purpose of this lab was to differentiate between accuracy and precision by calculating the mass per millimeter, or the density of the unknown liquid using two different methods

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Introduction

Does Accuracy and Precision Play a Role in Calculating the Density of an Unknown Liquid by Two Different Methods? Purpose: The purpose of this lab was to differentiate between accuracy and precision by calculating the mass per millimeter, or the density of the unknown liquid using two different methods. The test is done three times to measure precision (how exact a measurement it) and to measure accuracy (how close a value is to the accepted value). Hypothesis: I believe that method 1 will be precise in density, volume and mass, and that method number 2 will be accurate in those related fields. Materials: * 100mL beakers (3) * 100mL graduated cylinder * Thermometer * Felt tip pen * Ruler * Electronic balance Procedure: 1. Prepare a data table. Include room in your table for three trials for each method. 2. Using a felt tip pen, make a mark on one of the 100mL beakers about 2 cm from the top. Measure the height inside the beaker from the mark to the bottom of the beaker. ...read more.

Middle

5. Density = Mass Density = Mass Density = Mass Volume Volume Volume Density = 69.87 Density = 68.15 Density= 71.51 79 78 82 Density = 0.88 Density = 0.87 Density = 0.87 6. 0.88 + 0.87 + 0.87 = 0.87 The average density using the first method was 0.87 g/Ml 7. Percent error = difference between observed value and accepted value x 100 accepted value = 0.87 - 0.7854 0.7854 = 0.0846 0.7854 = 0.108 x 100 = 10.8 % Discussion: By looking at the results, it is shown that the density of the liquid for method 1 was 0.89g. The known density for the liquid at the given temperature was 0.7854g, and the percent of error was 13.4%. As for method 2 the density of the liquid was 0.87g. The known density for the liquid at the given temperature was 0.7854g, and the percent of error was found to be 10.8%. , It is clear to see that the graduated cylinder proved to be a more accurate tool for measurement in this lab; thus, completing the purpose of the lab. ...read more.

Conclusion

It was found to be a more accurate method because it had 2.6% less of a percent error than method 1. It is said that without a high degree of precision, a problem may go undetected and uncorrected, thereby affecting the overall accuracy. Therefore it can be concluded that the second method also had some level or precision in order for it to have been accurate. Conclusion: In conclusion, it has been determined by looking at the data that the graduated cylinder is a more accurate method of measuring liquid amounts. The reason for this is that the graduated cylinder's average density was 0.87g where as the beaker's average was 0.89g, by comparing the two to the accepted value of 0.7854g, conclusions can be drawn. It can be concluded that the graduated cylinder was closer to the accepted value than the beaker was. The percentage error for the beaker was found to be 13.4 %, and the graduated cylinder percentage error was 10.8%. With this statement, it accomplishes the purpose of the lab, which was to find which of the two tools were more accurate and precise. ?? ?? ?? ?? Etran Bouchouar 5/10/2007 ...read more.

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