135. Solving a chemistry problem

135. Solving a chemistry problem

Option 3.
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.

Option 3. Surfactant - heptanol
С•103, mol/dm3 0.0 0.04 0.100 0.200 0.316 0.500 0.794 1.000
σ•103, J/m2 72.75 71.40 70.90 70.00 69.20 68.20 67.20 66.80

Additional information:

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