As discussed in the lab manual, in preparing an ester by Fischer
esterification one generally uses a large excess of one reactant to
increase the amount of product formed; in this experiment, we used
a large excess of acetic acid. Explain why it is easier to remove
excess acetic acid from the product ester than it would be to
remove unreacted 3-methyl-1-butanol if this alcohol had been the
reactant used in excess.