Laboratory Techniques And Measurements Essay

1675 words - 7 pages

Purpose of Experiment:
The purpose of this experiment will be to gain an understanding of the universal used system of measurements, known as the “International System of Units” or SI within a lab experiment. This system will then be used to measure temperatures, density and observe the nature of dilutions while using the M1 x V1 = M2 x V2 equation. The Archimedes Principle will be the standard for this experiment.
Procedure:
Read and understand the standard system of measurement known as the SI system. This will be done through the testing of different items to determine volume, mass, length, temperature and then using these measurements to properly calculate density and concentration.
...view middle of the document...

5 0.5 0.5 0.625 6.4

Data Table 6: Displacement Method.

Object
Mass
(g) Initial volume of graduated cylinder (mL) Final volume of graduated cylinder (mL) Object Volume (mL)
Density
(g/mL)
Magnet 4 6 8 2 2
Metal bolt 8.1 6 8.1 2.1 3.86

Data Table 7: Archimedes’ Method.

Object
Mass
(g) Mass of Displaced Water (g) Volume of Displaced Water (mL)
Density (g/mL)
Metal Bolt 8.1 1.1 1.1 7.36
Magnet 4 0.8 0.8 5
Data Table 8: Initial Concentration.

Chemical
Mass
(g) Molecular Weight (g) Moles in Volumetric Flask Total Volume (L)
Molarity
(mol/L)
Sugar

(C12H22O11) 8 342.186 .023 .025 .92

Data Table 9: Dilution Series.

Dilution
Volume
(mL)

Mass (g)
Density (g/
mL) Initial Concentration (M) Volume Transferred (mL) Final Concentration (M)
0 25 mL 27.4 1.096 0 mL .92
1 25 mL 24.8 0.992 .92 2.5 mL .092
2 25 mL 24.5 0.98 .092 4.5 mL .017
3 25 mL 24.5 0.98 .017 3 mL .002
4 25 mL 24.3 0.97 .002 6 mL .0005
Observations:
During the course of this lab multiple different forms of data collection and calculation were used. While some methods were more effective than others it is difficult to determine which were more reliable. Calculating the length, height and width of a specific object was very standard and left little room for error it wasn’t always the best way to evaluate the density of an object due to the verifying degree between two of the same objects. For example since a CD is man-made two of the same CD’s from the same package could vary slightly in size. After taking time to understand the instruments within the lab and becoming familiar with the way they are used to calculate mass, temperature, volume and density I feel that I am more than capable of working with the foundations of all future lab requirements. My understanding of the “International System of Units” is substantially better from conducting this lab and I feel that it is extremely beneficial that there is one standard system of measurements. This experiment in addition to my own personal research has led me to believe that the Archimedes Principle for measuring density of an object is a reliable and effective method. However in a lab environment such as one setup within your own home I determined that there is a large room for error as I will explain in the following section.
Conclusions:
This lab is a great way to become familiar with the “International System of Units” and provides the basic understanding of measuring and calculating basic measurements used in the basics of Chemistry. The Archimedes Principle which was the standard for this experiment is not as widely used when determining density of items and this is unfortunate because it can be a quick and easy way in determining the density of an object, which can allow the scientist to determine so much about the test object. I did find however that there is a larger room for error when using the Archimedes Principle due to human error within the lab....

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