2(c) 1. Plot a surface tension isotherm and find the surface activity of the substance from the graph.
2. Find the negative derivatives –dб/dС for concentrations for which the values ​​of 6 do not lie on the tangent drawn to the initial section of the isotherm.
3. Having determined the negative derivatives –dб/dС, calculate the Gibbs adsorption for these derivatives.
4. Calculate the C/G ratios for all values ​​of G and plot a graph of C/G versus C. Using the linear section of the last graph, find the constant of the Langmuir equation.
5. Calculate the area occupied by an acid molecule in the surface layer S0. Option 2
Solute Butyric acid
C•10–3 mol/m3 0 0.07 0.18 1.00 3.00 4.50 6.00
6•103 J/m2 71.96 70.00 66.92 54.66 39.53 32.92 28.00
B, J/m2 0.0194

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