II. Purpose/Background: The purpose if this lab was to determine the density of water and an unknown liquid. Density is defined as the mass of a substance divided by its volume. It is an intrinsive property of matter and is used to specifically characterize substances.
III. Procedure: 1.We massed an empty 10mL graduated cylinder to the nearest .01g. 2.Then, we filled the graduated cylinder with 4.0-5.0 mL of distilled water, 3.massed it to the nearest 0.1 ml and 4. recorded the data. Then to determine the density of the unknown liquid; we repeated the steps.
IV. Data and Results
Table 1
Distilled Water Trial 1 Trial 2 Trial 3 Average Density
Mass of graduated cylinder and water 30g 34.9g 34.5 -----------------------
Mass of empty graduated cylinder 25.59g 25.59g 25.59g -----------------------
Mass of water ONLY 4.41g 9.49g 9.49g -----------------------
Volume of Water 4 mL 9.5 mL 9 mL -----------------------
Density of water 1.1025 g/mL .99 g/mL 1.054 g/mL 1.05 g/mL
Table 2
Unknown Liquid Trial 1 Trial 2 Trial 3 Average Density
Mass of graduated cylinder and unknown 33.89g 38.50g 37.32g -----------------------
Mass of empty graduated cylinder 25.59g 25.59g 25.59g -----------------------
Mass of unknown ------------------------
Volume of unknown 6.5mL 8.71mL 7.89mL ------------------------
Density of unknown
Table 3: Accepted Values for Density of Various Liquids
LIQUID DENSITY (g/mL) at 20˚C
Ethanol 0.789
Isopropyl Alcohol 0.786
Methanol 0.791
Mineral oil 0.830
Hydrogen Peroxide 1.110
Glycerin 1.261 V. Graphs
VI. Sample Calculation D= M÷V = 4.8g ÷ 5.1mL = .94 g/ml
VII. Discussion/Conclusion
In this lab, we calculated the mass of water and an unknown liquid. After finding the density of the unknown liquid we concluded that the liquid was Mineral Oil.
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