Laboratory Techniques & Measurements
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Laboratory Techniques & Measurements
Objectives:
Become familiar with several important laboratory techniques. Gain proficiency with some of the common measuring devices used in a chemistry laboratory. Determine the volume, mass, length, temperature, and density of objects and liquids
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1. Length Measurements:
Object
Length (cm)
Length (mm)
Pop Can
12.0
120.0
iPhone
11.7
117.0
TV Remote
16.3
163.0
2. Temperature Measurements:
- Hot water from tap (⁰C) – 47
Boiling Water (⁰C) – 61
Boiling Water after 5 mins.(⁰C) – 73Cold water from tap (⁰C) – 15
Ice Water (⁰C) – 6
Ice Water after 5 mins. (⁰C) – 4
3. Volume Measurements:
- Test tube volume (mL) – 10
- Number of drops in 1 mL – 9
- Pipet volume (mL) – 4
4. Mass Measurements:
- Object
Estimated Mass (g) – 7.8
Actual Mass (g) – 9.2
5. Density Measurements:
Mass A
Mass B
Mass A-B
Object
Graduated
Cylinder +
Substance
Hypothesis on Salt Compared to Water: The salt solution will have a greater density than pure water as the substance mass is lager.
6. Densities of Irregular Objects:
Mass A
Mass B
Mass B-A
Object
Graduated
Cylinder Volume
(mL)
Graduated
Cylinder + Object (mL)
Object Volume (mL)
Object Mass (g)
Density M/V
Metal bolt
Water Displacement
Method
Questions:
A. Some reasons for the water not boiling at 100⁰C could be: different temperature settings, not allowing enough time to fully boil and experimental error.
B. 102⁰C-100⁰C 99.2-100
100⁰C 100
2-0.8
100⁰C 100⁰
0.02 X100%-0.008X100
=2=-0.8
C. Height= 3.6, Base=4.21, Width= 1.17
Volume = bXh/w
4.21X3.6/1.17 = 13.31
Density= mass/volume
21.3/13.31 = 1.6
D. Density= mass/volume
19.30=26.15/V
-26.15X19.30=V
-504.69=V
V=504.69
Conclusion:
Some new things that I learned from this lab are experimental errors can drastically effect the outcome and adding a substance such as salt to water will increase the density of water. I believe I did meet the lab objectives because in result of this lab I became familiar with lab techniques, gained experience using lab measuring devices and I learned the volume, mass, length temperature and density of some objects and liquids.