Construct the phase diagram using temperature as the ordinate (vertical axis) and mass fraction of aniline as
Question:
Construct the phase diagram using temperature as the ordinate (vertical axis) and mass fraction of aniline as the abscissa (horizontal axis). Indicate the number and type of phases present in each of the regions of the phase diagram. State the uncertainty in your thermometer readings (what limits the accuracy of each measurement). Give the results from your repeat measurements of the temperature at which the samples are cloudy and calculate the uncertainty in your measurements (the scatter in the data about the mean). Compare the scatter to the uncertainty in each thermometer reading. Comment on what is the major source of error in your experiment.
1. (a) According to your phase diagram, what are the compositions of the two phases that are formed when a mixture with an overall 0.60 mass fraction of aniline is cooled from 80°C to 50°C? Draw tie-lines on your phase diagram to show how you determined the compositions of the two phases. State the compositions in words, in terms of the mass fraction of aniline in the liquid. (b) Use the lever rule to calculate the relative proportions of the two phases that form
2. Find from your phase diagram: heptane. (a) The solubility of aniline in heptane at 60°C in mol of aniline per gram of (b) The solubility of heptane in aniline at 60°C in mol of heptane per gram of aniline. Draw tie-lines on your phase diagram to show how you determined the compositions.
3. What is the upper consolute temperature? Draw a line on your phase diagram to indicate where it is. State the upper consolute temperature together with your estimate of its uncertainty.