Product details

Distribution equilibrium

Distribution equilibrium

Item no.: P3030701

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  • Description
  • Scope of Supply
  • Accessories
  • Downloads and Documents

Principle

At constant temperature and under constant pressure, a dissolved substance distributes itself between two immiscible liquids in a constant concentration ratio. This ratio is equal to the partition coefficient (distribution coefficient) of the substance examined in the given two-phase system.

Benefits

  • Modern, easy-to-use photospectrometer

Tasks

  1. Measure the extinction of various concentrated solutions of trans-azobenzene in acetonitrile at constant wavelength. Subsequently determine the equilibrium concentrations (extinctions) of trans-azobenzene in the system n-heptane / acetonitrile after single and repeated distribution at constant temperature.
  2. Calculate the partition coefficients and effectiveness of the extractions from the experimental data and compare them.

What you can learn about

  • Principles of thermodynamics
  • Partial molar free enthalpy (chemical potential)
  • Equilibrium between phases
  • Distribution and extraction
  • Nernst distribution equation
  • Lambert-Beer law
  • Photometry

Necessary accessories

  • Precision balance 620g/0.001g

 

Device Name Item no. Qty
Converter USB - RS232, active 14602-10 1,00
Erlenmeyer flask,Duran®, narrow neck, 250 ml 36124-00 1,00
Erlenmeyer flask, Duran®, narrow neck, 500 ml 36121-00 1,00
Trans-azobenzene f. synth., 25 g 31064-10 1,00
Spectrophotometer WPA S800+, 325...1100 nm 35603-99 1,00
Cell for spectrophotometer, optical glass 35664-00 2,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1,00
Microspoon, steel 33393-00 1,00
Erlenmeyer flask, Duran®, narrow neck,1000 ml 36122-00 1,00
Erlenmeyer flask, Borosilicate, narrow neck, 500 ml 46143-00 1,00
Erlenmeyer flask, borosilicate, narrow neck, 250 ml 46142-00 1,00
Rubber stopper,d=44/36mm,w/o hole 39262-00 1,00
Rubber stopper, d = 35 / 29 mm, without hole 39259-00 2,00
Volumetric flask, Borosilicate, 50 ml, IGJ12/21 36547-00 4,00
Volumetric flask 250 ml, IGJ14/23 36550-00 1,00
Funnel, glass, top dia. 50 mm 34457-00 1,00
Retort stand, h = 750 mm 37694-00 1,00
Support ring, i.d. 70mm, 37721-01 2,00
Right angle boss-head clamp 37697-00 2,00
Separatory funnel 250 ml pear-sh. 36884-00 4,00
Separatory funnel 1000 ml 35850-04 1,00
Volumetric pipette, 10 ml 36578-00 1,00
Volumetric pipette, 20 ml 36579-00 2,00
Pipette dish 36589-00 1,00
Pipettor 36592-00 1,00
Beaker, Borosilicate, tall form, 100 ml 46026-00 2,00
Pasteur pipettes, 250 pcs 36590-00 1,00
Rubber caps, 10 pcs 39275-03 1,00
Thermometer -10...+50 °C 38034-00 1,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Acetonitrile 1000 30000-70 1,00
n-heptane, extra pure 250 31366-25 1,00
Document     Filesize
p3030701e.pdf Experiment guide, English 374.94 KB

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