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.
- Modern, easy-to-use photospectrometer
- 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
- 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
- Precision balance 620g/0.001g