# There was percent error in the densities when using

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There was percent error in the densities when using the different glassware because of the variation of the temperature in the room as well as the difference in the precision and accuracy of the three different types of glassware used. The volume measurements varied so much because each of the different glassware’s had different amounts of significant figures and some were more precise and accurate than others. For example, the 50 mL buret had the most significant figures because the miniscule increments allowed for the most precise and accurate measurements with minimal approximation compared the the other two pieces of lab glassware. In order to improve the results of the experiment the same electronic balance should have been used over the course of the entire experiment. Another possible way to improve the results would have been to dry the glassware between weighing to ensure that the masses were more accurate. If asked to measure 38 mL of water the 50 mL buret would be the best measuring device because it has the lowest average percent error and is therefore the most precise. Additionally, if asked to measure 38.5 mL of water the answer would be the same because the 50 mL buret is still the most accurate and precise measuring device out of the three. Conclusion The goals of this lab were fully met. The lab group familiarized themselves with the concepts of accuracy and precision, as well as learned to use correct significant figures when dealing with the lab glassware. Also, the lab group was introduced to many properties while using the different pieces of lab glassware, including density, which was found to be the mass of
an object divided by the total volume of the object. The results of the lab were reasonably accurate, with a minimum percent error of 1.534% and a maximum percent error of 8.28%. Based upon the results of the lab the 50 mL beaker is recommended for measuring larger amounts of liquids, the 10 mL graduated cylinder recommended to be used for only a small amounts of liquids and the 50 mL buret is only recommended for extremely small amounts of liquids. When performing the lab, it is important to make sure that the same electronic balance is used to record the masses of all of the glassware and that each piece of glassware is completely dry before recording the mass. Works Cited Arizona State University Department of Chemistry & Biochemistry. How is Lab Glassware Used? Pg 2 Bauer, et al. CHM 113/116 Lab Manual, 3rd edition; Cengage Learning: Boston, 2009.
Investigation ___How is Lab Glassware Used? __ Lab Section and Group Number: __70263___, 3_______ Team Contribution Form Identify the percent contribution each team member made in this investigation, listing your name first. Name: Percent Contribution: ______Coltin Gerhart ________ ______25%______ ________Nathaniel Guntermann _____ ____25 %___ _________Blake Hilliker __________ _____25 %_______ __________Karim Mardambek______ ____25%________ Comments