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Title: Density Measurements and Partial Molar Volumes
Description: Pre-lab report that consists of: objectives, materials, procedure, experiment, raw data
Description: Pre-lab report that consists of: objectives, materials, procedure, experiment, raw data
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Regine Lee
Sept
...
Objectives: To be able to measure the density of various solutions by the changes in volumes
[of 1-‐propanol] with varying concentrations using a pycnometer
...
Introduction: Partial molar volume is the contribution that a component of a mixture makes
to the overall volume of the solution
...
V1 = (∂V/ ∂n)pT or V = n1V1+n2V2+n3V3…nkVk (for binary solutions)
A pycnometer or a specific gravity bottle is a flask with a stopper that has a capillary
tube that allows air bubbles to escape and it’s used to obtain accurate measurements of density
...
Materials Chemical Properties
Safety Precautions
1) 1-‐propanol -‐ colorless liquid -‐ Flush skin and eyes with plenty water
(CH3CH2CH2OH) -‐BP: 97
...
6oC -‐ Remove to fresh air
...
1g/mole -‐Flammable
2) water (H2O) -‐BP: 100oC; colorless liquid
-‐ weight: 18
...
Procedure
A
...
Carefully clean the glassware with soap and water and then rinse with a small amount
of acetone as described above
...
Weigh the dry flask and stopper on the analytical balance in the balance room
...
Determine the exact volume of your pycnometer by filling it fully with water, inserting
the stopper, and tapping the sides gently to remove the air bubbles
...
Dry the sides and weigh the full pycnometer on the analytical balance
...
Use the known density of water located in the CRC handbook
to determine the volume of water contained in the full pycnometer flask
...
Be certain to use the known density value at the correct temperature
...
Do the same for the procedure in the liquid unknown
...
B
...
(since density
varies with temperature) (use temperature from the literature data)
2) Do 2 trials for at least 5 compositions (5 different concentrations of your aqueous solution)
V
Title: Density Measurements and Partial Molar Volumes
Description: Pre-lab report that consists of: objectives, materials, procedure, experiment, raw data
Description: Pre-lab report that consists of: objectives, materials, procedure, experiment, raw data