# Laboratory Techniques & Measurements

## 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
• 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
• Cylinder Volume
• (mL)
• 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.

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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.

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