Distribution equilibrium
Article No: P3030701
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 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. Calculate the partition coefficients and effectiveness of the extractions from the experimental data and compare them. Learning objectives 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