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This study source was downloaded by 100000795075979 from CourseHero com on 02 11 2023 23 39 40 GMT 06 00 https www coursehero com file 50313019 Chem 141 Lab Report 1odt Experiment 1 Calibration of Glassware Density andError AnalysisTravis WilsonChemistry 141Section 1193Prof Stanfield6 11 19 This study source was downloaded by 100000795075979 from CourseHero com on 02 11 2023 23 39 40 GMT 06 00 https www coursehero com file 50313019 Chem 141 Lab Report 1odt ObjectiveThis experiment involves the comparison of beakers graduated cylinders and pipets and the accuracy of the volume of a liquid each delivers To achieve this approximately 10 mL of water will measured into each piece of glassware and compared to the exact volume of each sample The standard deviationof each piece of glassware s measurements will be calculated and the most accurate piece of glassware will be used to determine the the density of Coke and Diet Coke This experiment is designed to teach both the accuracy of commonly used glassware and methods of statistical analysis This study source was downloaded by 100000795075979 from CourseHero com on 02 11 2023 23 39 40 GMT 06 00 https www coursehero com file 50313019 Chem 141 Lab Report 1odt ProcedureLehman J Olmstead T et al 2002 Experiment 1 Calibration of Glassware Density and Error Analysis In Grossmont College Chemistry 141 Laboratory Manual 7th Edition pp 1 9 1 14 El Cajon California For determining the density of Coke and Diet Coke I used the same procedure used to calibrate the pipet used in Part A However I did use clean empty 100 mL to collect the 10 mL samples of soda instead of a plastic bottle for easy cleanup I started by weighing out the mass of the empty beaker for the Coke sample and used the pipet to deliver 10 mL of Coke I then measured the mass of the beaker and Coke and subtracted the mass of empty beaker to determine the mass of Coke deposited I deposited two more 10 mL samples of Coke into the beaker pausing between each addition to measure the amount of Coke deposited by weighing the beaker and Coke and subtracting the previous measurement I repeated this process for three trials with Diet Coke and divided each sample mass by the mean volume of liquid delivered by the pipet to determine the density of the two sodas This study source was downloaded by 100000795075979 from CourseHero com on 02 11 2023 23 39 41 GMT 06 00 https www coursehero com file 50313019 Chem 141 Lab Report 1odt Data and CalculationsBeaker Calibration Calculating volume of water deliveredTrial 1 3 27 g water delivered 1 mL 9976582 g 3 28 mL water deliveredTrial 2 3 43 g water delivered 1mL 9975408 g 3 44 mL water deliveredGraduated Cylinder Calibration Calculating volume of water deliveredTrial 1 9 76 g water delivered 1 mL 9973480 g 9 79 mL water deliveredTrial 2 9 79 g water delivered 1 mL 9973480 g 9 82 mL water deliveredPipet Calibration Calculating volume of water delivered9 99 g water delivered 1 mL 9974210 g 10 02 mL water delivered9 94 g water delivered 1 mL 9974210 g 9 97 mL water deliveredTable 1 Beaker Calibration CalculationsTrial 1Trial 2Trial 3Trial 4Trial 5Trial 6Mass waterdelivered3 27 g3 43 g3 15 g2 98 g3 26 g3 01 gVolumewaterdelivered3 28 mL3 44 mL3 16 mL2 99 mL3 27 mL3 02 mLAveragevolumedelivered 3 28 3 44 3 16 2 99 3 27 3 02 6 3 19 mLDeviationfrom averagevolume 09 mL 25 mL 03 mL 20 mL 07 mL 17 mLDeviationsquared 0081 mL 0625 mL 0009 mL 04 mL 0049 mL 0289 mLSum ofdeviationsquared 0081 0625 0009 04 0049 0289 6 1453 mLStandarddeviationSqrt 1453 5 1705 This study source was downloaded by 100000795075979 from CourseHero com on 02 11 2023 23 39 41 GMT 06 00 https www coursehero com file 50313019 Chem 141 Lab Report 1odt Table 2 Beaker Calibration RangesLow end of rangeHigh end of rangeNumber of rialswithin range68 of values fallwithin3 19 1705 3 0195 mLand3 19 1705 3 3605 mL495 of values fallwithin3 19 2 1705 2 849 mLand3 19 2 1705 3 531 mL2 99 fall within3 19 3 1705 2 6785 mLand3 19 3 1705 3 7015 mL61 Based on my measurements at least the standard deviation says the beaker was precise although theaccuracy was terrible 2 Mean error at 10 mL 6 72 6 56 6 84 7 01 6 73 6 98 6 6 81 mL True value at 50 mL would likely be somewhere between 43 19 mL and 56 81 mL error 3 19 10 00 10 X 100 68 1 The accuracy of my measurements is very bad probably resulting from a systematic error Despite this I ll rate the beaker s accuracy as poor Graduated Cylinder Calibration 1 Average deviation 05 02 03 05 00 00 6 025Standard deviation sqrt 0025 0004 0009 0025 00 00 5 0355 mL2 Mean value of mass of water 9 76 9 79 9 84 9 86 9 81 9 81 6 9 81gVolume of water 9 81 g 1 mL 9974210g 9 84 mLBased on the two standard deviations the graduated cylinder is much more precise than the beaker 3 Percent error 10 0 mL 9 84 mL 10 0 mL X 100 1 60 The graduated cylinder s accuracy is fair Volumetric Pipet Calibration1 Average deviation 04 01 01 00 03 02 6 02Standard deviation sqrt 0016 0001 0001 00 0009 0004 5 0245 mLMean value of mass of water 9 99 9 94 9 94 9 95 9 92 9 93 6 9 95 gVolume of water 9 95 g 1 mL 9974210 g 9 98 mLPercent error 10 0 mL 9 98 mL 10 0mL X100 2 2 Based on the percent error and standard deviation the pipet is both accurate and precise This study source was downloaded by 100000795075979 from CourseHero com on 02 11 2023 23 39 41 GMT 06 00 https www coursehero com file 50313019 Chem 141 Lab Report 1odt 3 The pipet was the most accurate and precise of all three sets of glassware The graduated cylinder was the second best in both accuracy and precision followed by the beaker which was the worst of the three in both Table 3 Analysis of Volume InstrumentsInstrumentUncertaintyAverageVolumeStandardDeviationTrue Value errorbeaker 1 mL3 19 mL0 1705 mL3 19 mL68 1 Graduatedcylinder 01 mL9 84 mL0 0355 mL9 84 mL1 60 pipet 01 mL9 98 mL0 0245 mL9 98 mL0 200 Table 4 Coke DensitiesTrial 1Trial 2Trial 3Temp22 00 C22 00 C22 00 CVolume9 975 mL9 975 mL9 975 mLMass60 54 g 50 29 g 10 25 g70 78 g 60 54 g 10 24 g81 10 g 70 78 g 10 32 gDensity9 96 g 9 975 mL 9985 g mL10 24 g 9 975 mL 1 027 mL10 32 g 9 975 mL 1 035 g mLMass of empty beaker 50 29 gAverage density 1 020 g mLTable 5 Diet Coke DensitiesTrial 1Trial 2Trial 3Temp22 40 C22 40 C22 40 CVolume9 975 mL9 975 mL9 975 mLMass9 96 g9 93 g9 91 gDensity 9985 g mL …

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