. When water and methanol, CH3OH(l), are mixed, the total
Chapter 4, Problem 100(choose chapter or problem)
. When water and methanol, CH3OH(l), are mixed, the total volume of the resulting solution is not equal to the sum of the pure liquid volumes. (Refer to Exercise 99 for an explanation.) When 72.061 g H2O and 192.25 g CH3OH are mixed at 25 C, the resulting solution has a density of 0.86070 g/mL. At 25 C, the densities of water and methanol are 0.99705 g/mL and 0.78706 g/mL, respectively. (a) Calculate the volumes of the pure liquid samples and the solution, and show that the pure liquid volumes are not additive. [Hint: Although the volumes are not additive, the masses are.] (b) Calculate the molarity of CH3OH in this solution.
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