Give a method to find the size of a molecule of oleic acid.

1.	Give a method to find the size of a molecule of oleic acid.
Answer» First of all 1/500 solution of oleie acid is prepared in alcohol by dissolving 1 cm³ of oleic acid in 500 cm³ of alcohol. Put n drops of this solution on the surface of water. Thus a film of oleic is formed. This film is stretched so that its thickness is just equal to the molecular size. With passage of time, alcohol is evaporated and a with layer of oleic acid is formed on the surface on water. The area of thin layer is measured with a tracing paper and a grapn paper. Volume of n drops = nv Volume of oleic acid in n drops of solution = nV X 1/500 cm³. Now thickness of film = Volume of film/Area of film t = nv/500 x 1/A cm Since thickness of film is equal to the molecular size and hence size of the molecule can be Calculated.

Answer»

First of all 1/500 solution of oleie acid is prepared in alcohol by dissolving 1 cm³ of oleic acid in 500 cm³ of alcohol. Put n drops of this solution on the surface of water. Thus a film of oleic is formed. This film is stretched so that its thickness is just equal to the molecular size. With passage of time, alcohol is evaporated and a with layer of oleic acid is formed on the surface on water.

The area of thin layer is measured with a tracing paper and a grapn paper.

Volume of n drops = nv

Volume of oleic acid in n drops of solution

= nV X 1/500 cm³.

Now thickness of film = Volume of film/Area of film

t = nv/500 x 1/A cm

Since thickness of film is equal to the molecular size and hence size of the molecule can be Calculated.

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