Question

Use the following data construct a phase diagram of the phenol-water systen Phenol layer 5. t/oc 20 25 30 35 40 45 50 Aq. Layer 8.4 8.71 8.92 9.34 9.78 10.62 12.08 13.88 17.10 22.26 35.90 72.24 71.38 69.95 68.28 66.81 65.02 62.83 60.18 56.10 49.34 35.90 60 65 68.8 a) b) c) What will be the compositions of the layers formed from a solution of 30 g phenol and 70 g water maintained at 30°C A solution of 20 g phenol and 80 g water is prepared at 70°C. How many phases will be present? At what temperature will two phases appear if the solution part (b) is cooled gradually? What will be the compositions of the two phases?

Answer 1

(a) At 30 degrees c 30 g phenol/100 g mixture times 100% = 30% phenol (b) Af 70 degrees c 20% phenol (c) 38.8 degrees c, 68.8 degrees c