Rubbing alchol sold in stores is aqueous 2-propanol, CH3CHOHCH3(aq). Rubbing alcohol is availible in concentrations of 70.0% and 91% 2-propanol by volume. To make 100. mL of 70.% aqueous 2-propanol, 70.mL of 2-propanol is dilute with enough water to produce a total volume of 100.mL. In a laboratory investigation, a student is given a 132mL sample of 91% aqueous 2-propanol to separate using the process of distillation.