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chem lab report

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chem lab report
Objectives:
1. To identify the relative densities of some common liquids and solids.
2. To determine the densities of water, an unknown liquid, a rubber stopper, and an unknown rectangular solid.
3. To determine the thickness of a piece of aluminum foil using the density concept.
4. To practice proficiency in performing the following experimental procedures: pippeting a liquid, weighing by difference, and determining a volume by displacement.
Apparatus:
Tall glass cylinder, glass marble, rubber stopper, cork, 125-mL Erlenmeyer flask with stopper, 150-mL beaker, 10-mL pipet, pipet bulb, 100-mL beaker, rubber stopper, unknown rectangular solid, aluminum foil ~10 x 10cm, 100-mL graduated cylinder, rectangle
Materials:
Methylene chloride, hexane, water, ice, unknown liquids

Observations: A)
Procedure
Observations
Water added to cylinder
Water fills the cylinder.
Methylene chloride added to water
A layer of methylene chloride forms below the water.
Hexane added to water
Layer of hexane forms on top of the water.
Glass marble added to cylinder
Glass marble sanks to the bottom of the cylinder.
Rubber stopper added to cylinder
Rubber stopper floats in between the layer of water and methylene chloride.
Ice added to cylinder
Ice floats in between the layer of hexane and water.
Cork added to cylinder
Cork floats on the layer of hexane

B) Density of Water
Items
1st Trial
2nd Trial
Mass of flask and stopper+ water(g)
105.51
105.51
Mass of flask and stopper(g)
95.71
95.71
Mass of water(g)
9.81
9.80
Volume of water(mL)
10.0
10.0
Density of water(g/mL)
0.981
0.980
Average density of water(g/mL)
0.981

C)Density of Unknown Liquid
Items
1st Trial
2nd Trial
Mass of flask and stopper+ water(g)
102.27
102.27
Mass of flask and stopper(g)
95.71
95.71
Mass of unknown liquid(g)
6.56
6.56
Volume of unknown liquid(mL)
10.0
10.0
Density of unknown liquid(g/mL)
0.656
0.656
Average density



References: www.physics.appstate.edu/resources-analysis www.riverdell.org/cms/lib05/Density www.water.usgs.gov/edu/Density www.epa.gov/chemfact/S-DCM.t

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