(a) Oleic acid does not dissolve in water hence, it is dissolved in alcohol.
(b) Lycopodium powder spreads over the entire surface of water when it is sprinkled evenly.
When a drop of prepared solution is dropped on water, oleic acid does not dissolve in water. Instead it spreads on the water surface pushing the lycopodium powder away to clear a circular area where the drop falls. We can therefore, measure the area over which oleic acid spreads. (c) In each mL of solution prepared volume of oleic acid =`1/20mLxx1/20=1/400mL`
(d) Volume of n drops of this solution of oleic acid can be calculated by means of a burette and measuring cylinder and measuring the number of drops.
(e)If n drops of the solution make 1 mL, the volume of oleic acid in one drop will be `1/((400)n)mL.`