In a lab, we prepared n-butyl bromide from n-butyl alcohol. I need to know the purpose of the HCl wash on the product. I know that the NaOH and Water washes were used to remove the leftover from the previous washes. But I can't figure out the reason for the HCl wash. I know it has something to do with the left over unreacted alcohol but I'm not sure where to go from there.