Isopropyl alcohol is mixed with water to produce 36.0% (v/v) alcohol solution. How many milliliters of each component are present in 865 mL of this solution? Assume volumes are additive.

Answer 1

36.0% (v/v) means 36.0 mls of IPA/100 mls of solution. Since we assume the volumes are additive, this means you have 36.0 mls IPA + 64.0 mls H₂O. If you have 865 mls of this solution, 36% being IPA, that would be 865 ml x 36.0 ml IPA/100 ml soln = 311.4 mls of IPA. The H₂O would thus be 865 ml - 311 ml = 554 ml H₂O. So, in summary, you would have 311 ml IPA and 554 ml H2O (using 3 significant figures).