How do you determine the polarity of a molecule?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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How do you determine the polarity of a molecule?
Part 1:
The Effect of Different Alcohols on Membrane Permeability
Alcohol is an organic solvent that, as you observed, disrupts biological membranes. The question you
are exploring in this lab is whether there is a difference in the effect on membranes of different kinds of
alcohol. You will be testing the effect of 3 different alcohols (methanol, ethanol and n-Propanol) on the
permeability of biological membranes. The structural formulas of these three alcohols are shown below:
H
H H
H-C-OH
H
Methanol
M.W. 32.04g/mol
●
H
H-C-C
H
H
H
Ethanol
M.W. 46.
-OH
16.07 g/mol
H
T
н-с
C C
H
H H
-OH
n-Propanol
M.W. 60.0952 g/mol
Prior to performing the experiment, identify some of the characteristics that determine permeability:
What is the molecular weight (M.W.) of each of these alcohols? Fill in above.
Rank these three alcohols from most polar to least polar. What criteria did you use to determine
polarity?
Transcribed Image Text:Part 1: The Effect of Different Alcohols on Membrane Permeability Alcohol is an organic solvent that, as you observed, disrupts biological membranes. The question you are exploring in this lab is whether there is a difference in the effect on membranes of different kinds of alcohol. You will be testing the effect of 3 different alcohols (methanol, ethanol and n-Propanol) on the permeability of biological membranes. The structural formulas of these three alcohols are shown below: H H H H-C-OH H Methanol M.W. 32.04g/mol ● H H-C-C H H H Ethanol M.W. 46. -OH 16.07 g/mol H T н-с C C H H H -OH n-Propanol M.W. 60.0952 g/mol Prior to performing the experiment, identify some of the characteristics that determine permeability: What is the molecular weight (M.W.) of each of these alcohols? Fill in above. Rank these three alcohols from most polar to least polar. What criteria did you use to determine polarity?
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