chem lab report

Topics: Density, Volume, Liquid Pages: 6 (1425 words) Published: September 27, 2014

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 of unknown liquid(g/mL)
0.656

D)Density of Rubber Stopper
Items
1st Trial
2nd Trial
Mass of rubber stopper(g)
5.085
5.085
Final cylinder reading (mL)
69.0
69.5
Volume of rubber stopper(mL)
5.0
5.5
Density of rubber stopper(g/mL)
1.017
0.925
Average density of rubber stopper(g/mL)
0.971

E)Density of Unknown Solid
Items
1st Trial
2nd Trial
Mass of solid(g)
11.35
11.455
Length of solid(cm)
7.7
7.70
Width of solid(cm)
3.0
3.00
Thickness of solid(cm)
1.1
1.10
Volume of solid (cm3)
25
25.4
Density of solid(g/cm3)
0.45
0.458
Average density of solid(g/cm3)
0.45

F)Density of Aluminum Foil
Items
Measurement
Density of foil(g/cm3)
2.70
Length of foil(cm)
10.90
Width of foilcm)
10.00
Mass of foil(g)
0.439
Volume of foil (cm3)
0.163
Thickness of foil(cm)
1.50 X 10-3

Discussion:
The main objective of this experiment is to identify the density of the liquid and the solid. Density which is define as the amount of mass in a given volume is calculated by dividing the mass by volume of the object. For the first experiment (A) the instructor demonstration, the density of four objects and three solutions are being observed and investigated. The objects or solutions with higher density have bigger mass. So the position of objects and the solutions when being mixed together, determine its density. Procedure of the experiments with the addition of water, methylene chloride, hexane, glass marble, rubber stopper, ice and a cork into the tall glass cylinder. The position of every objects and solutions varies according to its densities. The theoretical value of water density is 1g/cm3. The position of water is between the hexane with a density of 0.65g/ml and the methylene chloride with a density of 1.33 g/cm3. Hexane layer forms above the layer of water and the layer of methylene chloride forms below the layer of water. Glass marble sank at the bottom of the cylinder. The position of...

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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