This portion of a phase diagram shows the vapor–pressure curves of a volatile solvent and of a solution of that solvent containing a nonvolatile solute. (b) What are the normal boiling points of the solvent and the solution? [Section 13.5]

Video transcript

Hello everyone today. We have the following question. Consider a pure volatile solvent and a solution of that solvent containing a non volatile solvent. Solute. The following partial phase diagram shows the vapor pressure curve of the solvent and the solution. Using the diagram determine the normal boiling points of the pure solvent and of the solution. So the for the solvent with the non volatile saw you that is going to lower the vapor pressure. And so we know that the normal boiling point normal BP is going to be at one atmosphere. So for one atmosphere that is this line here. And so we know we're going to have a lower vapor pressure and so therefore the normal boiling point for the solvent boiling point for the solvent and the boiling point of the song here or the solution. So for the solvent it's going to be this purple line here, So roughly about 70 degrees Celsius. And for the solution, if you a little bit more so the right It's going to be about 77°C. And with that we've answered our question. I hope this helped. And until next time.