105. Using a graphical method, determine the surface activity (-dσ / dC) at C → 0 of butyric acid at the boundary of its aqueous solution with air at 293 K according to the following experimental data:
C, mol/L 0 0.021 0.050 0.104 0.246
σ*103, N/m 72.5 68.1 63.7 58.2 49.8

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