81. Solving a chemistry problem
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2(c) 1. Plot a surface tension isotherm and find the surface activity of the substance from the graph.
- 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.
- Having determined the negative derivatives –dб/dС, calculate the Gibbs adsorption for these derivatives.
- 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.
- 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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