Based on the experimental data obtained in the study of the surface tension of the indicated aqueous surfactant solution at 20°C, calculate the area occupied by one surfactant molecule and the thickness of the adsorption monolayer in two ways: graphical and
analytical. For this:
Analytical method
1. Calculate the average value of the Cav concentration, the values of ∆С, ∆σ and ∆σ/∆С.
2. Calculate the amount of adsorption Г according to the equation Г= С av / RT(Δσ/ΔС) .
3. Calculate the S/G values and plot the adsorption isotherm in linear coordinates using the Langmuir equation S/G = f(S)
4. Determine graphically the values of G∞ and K.
5. Calculate So and δ.
7 option. Surfactant - nonanoic acid.
C*104, mol/dm3 0.0 0.40 0.8 1.26 1.58 2.51 4.00 6.31
σ*103, J/m2 72.75 68.90 66.40 63.00 60.90 55.90 50.20 44.60
If the file does not open for you, install the Rar archiver program. Inside the archive, the solution is in WORD format.
No feedback yet