Problem: The following diagram shows the vapor pressure curves of a volatile solvent and a solution of that solvent containing a nonvolatile solute. What are the normal boiling points of the solvent and the solution?

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The following diagram shows the vapor pressure curves of a volatile solvent and a solution of that solvent containing a nonvolatile solute.
The x-axis is temperature (degrees C) ranging from 40 to 70 with intervals of 10. The y-axis is pressure in atmospheres with one horizontal dashed line at 1.0 about two thirds of the way up the y-axis. Two parallel curves are plotted (red and blue). Both start at 40 degrees C about one-third of the way up the y-axis, but the red curve is above the blue curve. The red curve crosses 1.0 atmospheres at about 64 degrees C and the blue curve crosses 1.0 at 70 degrees C.

What are the normal boiling points of the solvent and the solution?

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Our tutors have indicated that to solve this problem you will need to apply the Boiling Point Elevation concept. If you need more Boiling Point Elevation practice, you can also practice Boiling Point Elevation practice problems.