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3 Pages

### Lab Report

Course: CHEM 121, Spring 2008
School: Ohio State
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Word Count: 304

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Edsinger Measurements Eric of Mass and Volume; Density (Experiment # 1) Under the Supervision of Tony Johnson Experiment Concluded on: March 26, 2008 Lab Report Due on: April 2, 2008 Purpose The purpose of this lab is to learn the proper techniques for using an analytical and top loading balance, and finding the density of an unknown solution by using a 10 mL pipet, a 25 mL buret and a 100 mL beaker....

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Edsinger Measurements Eric of Mass and Volume; Density (Experiment # 1) Under the Supervision of Tony Johnson Experiment Concluded on: March 26, 2008 Lab Report Due on: April 2, 2008 Purpose The purpose of this lab is to learn the proper techniques for using an analytical and top loading balance, and finding the density of an unknown solution by using a 10 mL pipet, a 25 mL buret and a 100 mL beaker. Procedure Please refer to General Chemistry Laboratory Experiments Volume 1 Spring 2008, by Judith Casey and Robert Tatz, pages 4-5, for the proper procedure for experiment one. The lab manual was followed throughout this entire experiment; however section C was where the lab was started rather than section A. This lab used approximately 50 mL of an unknown concetration of sodium chloride. Data See attached Report form for the data. Sample Calculations See attached paper Report Questions See attached paper Conclusion/Discussion In lab this preciseness and accuracy were very important in obtaining a correct density and a minimum deviation. Preciseness was the most important. The more precise the measurements, the closer the average would be to those measurements. This would account for a small deviation which is what is wanted. Most measurements in the lab were repetitive. This helped to make sure the deviations were minimal. The buret and pipet were used a fair amount in this lab, this lab explained the correct techniques for using them and any safety procedures which are critical in a lab. The analytical balance is much more precise than the top loading balance. This gave a clear precise reading so that we could be very sure about the weight of the solution, crucible and cover on the crucible. This accuracy leads to good accuracies in the calculations to find density. Also proper techniques for being safe in the lab were discussed and that was very helpful.
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