Answer:
(a) Oleic acid is soluble in alcohol
but insoluble in water.
(b) Lycopodium powder spreads on the entire
surface of water. When a drop of the solution of oleic acid in the solution
spreads on water surface as it does not dissolve in water. The drop pushed the
lycopodium powder particles away and creates a circular area where it falls,
thus enabling us to measure the area where oleic acid spreads.
(c) Since 20 mL (1 mL oleic acid + 19 mL
alcohol) contains 1 mL of oleic acid, oleic acid in each mL of the solution \[=\frac{1}{20}\,mL\].
Further, as this 1 mL is diluted to 20 mL by adding alcohol, oleic acid in each
mL of prepared solution.
\[=\frac{\left( \frac{1}{20}mL
\right)}{20}\]
\[=\left( \frac{1}{400} \right)\,mL\]
(d) By means of a burette (to allow the
solution to trickle out in drops so that these can be counted) and measuring
their volume with a measuring cylinder, the volume of \[n\] drops can be
calculated.
(e) If \[n\] is the number of drops in \[1\,mL\]
of the solutions, volume of oleic acid in one drop \[=\frac{\left[
\frac{1}{400} \right]mL}{n}\]
\[=\left( \frac{1}{400\,n} \right)mL\]
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