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
- Length Measurements:
- Object
- Length (cm)
- Length (mm)
- Pop Can
- 12.0
- 120.0
- iPhone
- 11.7
- 117.0
- TV Remote
- 16.3
- 163.0
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
Volume Measurements:
- Test tube volume (mL) – 10
- Number of drops in 1 mL – 9
- Pipet volume (mL) – 4
Mass Measurements:
- Object
- Estimated Mass (g) – 7.8
- Actual Mass (g) – 9.2
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:
Some reasons for the water not boiling at 100⁰C could be: different temperature settings, not allowing enough time to fully boil and experimental error.
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
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.
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