Isopropyl alcohol is mixed with water to produce a 37.0% (v/v) alcohol solution. How many milliliters of each component are present in 695 mL of this solution? Assume that volumes are additive.

Answer 1

37.0% (v/v) means 37.0 mls IPA/100 mls solution. Since we are assuming that the volumes are additive, we have 37.0 mls IPA + 100-37 = 63 ml H2O or looked at another way, 37% IPA and 63% H2O. For a given volume of 695 mls, the volume of each component would be ...

Isopropyl alcohol = 695 ml x 0.37 = 257 mls

Water = 695 x 0.63 = 438 mls