Lab Report #2

# Lab Report #2 - 15.25g 16.4g 16.6g 15.45g Results: 4% 8%...

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Objective: In this experiment, one will determine the density of liquid water. Once this density and its change with temperature are known, one can use this information to find out what volume should be occupied by a known mass of water at a given temperature. Materials: 1) 25ml Graduated Cylinder. 2) 4, 8, 12, and 16% NaCl solutions. 3) 1 unknown % NaCl solution. 4) Analytical Scale. Procedure: 1) Weigh the graduated cylinder by itself and record the data. 2) In your clean and dry cylinder put about 15ml of the 4% solution in to your graduated cylinder. 3) Measure the mass and record the data. 4) Wash out, and dry your cylinder. 5) Do steps 2 through 4 for each of the 5 solutions. Data: 4% 8% 12% 16% Unknown Volume of NaCl solution in cylinder 15ml 15ml 15ml 15ml 15ml Mass of graduated cylinder plus known NaCl solution 65.55g 63.75g 64.90g 65.10g 63.95 Mass of solution after mass of the graduated cylinder alone is subtracted (48.50g - X) 17.05g

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Unformatted text preview: 15.25g 16.4g 16.6g 15.45g Results: 4% 8% 12% 16% Unknown Density of NaCl solutions. (Density= Mass / Volume) 1.13 g/cm^3 1.01 g/cm^3 1.09 g/cm^3 1.01 g/cm^3 1.03 g/cm^3 NaCl Solutions 0.94 0.96 0.98 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 0.04 0.08 0.12 0.16 unknown Percentages Densities (g/cm^3) Series1 Conclusion: From this lab I am able to conclude that the density of a liquid has nothing to do with the percentage of the NaCl solution. This may be caused by bad data, mainly by human error. For example, my group may have measured the density wrong or mislabeled a data entry. There are many reasons for the data to be incorrect, but hopefully the labs in the future will be more accurate. Questions: I conclude that the percentage of NaCl is 14%. I deducted this because the unknown solution is between 12% and 16%, so I took the average of the two measurements....
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## Lab Report #2 - 15.25g 16.4g 16.6g 15.45g Results: 4% 8%...

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