Explain the measurement of molecular size of oleic acid
Answers
Based on the assumption that the layer is one molecule thick, we obtain the value of the size of the oleic acid molecule. Answer: The drop quickly spreads into a thin, large circular film of a molecular thickness. This is the oleic acid molecules standing on their hydrophilic ends.
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10^-9 m (approx.)
Aim:
We need to measure the molecular size of Oleic Acid.
Materials Needed:
- Oleic Acid
- Water
- lycosodium powder
- Big Film
- Big Container
Procedure to be followed:
First we have to have 1 cm^2 of oleic acid and mix it with 20 cm^3 of water. From this the concentration of the Oleic acid in 1 cm^3 of water would be 1 cm^3 / 40. In the next step we have to put some lycosodium powder on the water which is taken by us in a big container. In the next step we put a drop of the oleic acid solution in the surface of the water.
Then we put this solution of water on a big film of molecular thickness. Now we calculate the area. Assume that we dropped n- drops into the water.
We use the formula:
Volume = nV. cm^3
When we substitute the values into this formula:
The Amount of Oleic Acid we get
= nV / 400 cm^3
The Formula used for calculating thickness:
Thickness = Volume / Area
When we substitute the values into this formula:
= nV / 20 x 20 x A
From this we get to know that the value of Oleic acid is about 10^-9 m (approx.)