The result obtained for $\%$ ethanol in this experiment is obtained by the analysis of a single sample.

To increase confidence in the result, more samples should be analyzed. This could be done in one of

two ways:

Method A: Two more $2\mathrm{.}00mL$ samples from the diluted wine solution could be reacted with

potassium dichromate and their absorbance values used to determine $\%$ ethanol. This would

give a sample size of $3.$

Method B: The concentrated wine could be used to prepare $3$ dilute solutions $($instead of just

$.2\mathrm{.}00mL$ of each one of these dilute solutions could be reacted with potassium dichromate

and their absorbance values used to determine $\%$ ethanol. This would also give a sample size

of $3.$

Identify at least one advantage $($pro$)$ and at least one disadvantage $($con$)$ of each method.