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Physical chemistry phase diagram l-l and l-vapor


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kimia fisika

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Physical chemistry phase diagram l-l and l-vapor

  2. 2. Phase diagram 2 components liquid - liquid
  3. 3. Experiment : to determine the graphs of phenol composition-temperature and the critical solution temperatures [phenol] (%) 8 11 20 50 63 70 80 Phenol (mL) 4 5.5 10 25 31.5 35 40 Water (mL) 46 44.5 40 25 18.5 15 10 Results :
  4. 4. Phase diagram 2 components liquid - vapor
  5. 5. If the interactions between A and B stabilise the liquid phase then the vapour pressure will be depressed below its ideal value and the boiling temperature raised. Many liquid mixtures deviate from the ideal behaviour predicted by Raoult's law. Ideal- dilute solutions are those for which the solvent obeys Raoult's law and the solute Henry's law.
  6. 6. Ideal solution
  7. 7. In a fractional distillation, the boiling and condensation cycle is repeated to get a pure substance. This technique is used to separate volatile liquids. The vapor is collected and condensed in a simple distillation. This technique is used to separate a volatile liquid from a non-volatile solute or solid. Distillation distillate condensation
  8. 8. azeotrope Non ideal solution Azeotrope: 2 different types: a high-boiling azeotrope a low-boiling azeotrope is a particular mixture (two or more miscible liquids) which does not change the composition during the distillation In a high-boiling azeotrope if a maximum occurs in the phase diagram, the liquid is stabilized due to favorable interactions between A and B molecules
  9. 9. the liquid is destabilized due to unfavorable interactions between A and B molecule a low-boiling azeotrope
  10. 10. Phase diagram 2 components liquid – liquid & Liquid - vapor
  11. 11. X benz 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 PT 64 78 94 109 122 136 148 158 168 178 186 Problems : 1. Jika sebanyak 10 g A dan 50 g B dicampurkan pada suhu 25C. Keduanya hanya bercampur sebagian dan membentuk dua fasa. Jika % berat A dalam fasa I adalah 5%, dan dalam fasa II adalah 60%, hitung massa A dan B dalam dua fasa yang berada dalam kesetimbangan 2. Sistem benzena-toluena membentuk campuran dan tekanan total campuran tersebut merupakan fungsi dari komposisi sebagaimana yg diperlihatkan dalam tabel berikut. Buatlah diagram fasa P vs x untuk sistem tersebut ! Apakah sistem tersebut merupakan larutan ideal atau membentuk azeotrop ? jika larutan awal memiliki x benzena = 0,4 pada suhu berapa sebanyak ¾ bagian teruapkan ?