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
- 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) – 73
Cold 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.
The Essay on Corer To Ensure A Fair Test To Make The Cut Mass Water Concentration
Background Information. I think that this practical will be based on osmosis because, Osmosis is the random movement of water molecules from a high concentration to a low concentration. This will then happen between the chips and the liquid in the McCarthy bottles. This already tells us that the chips will vary in size from the concentration of water. Plan of the Experiment. Method 1 Firstly we ...
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.
