4.8. Using the graphical method, find the surface activity of butyric acid at the interface of an aqueous solution with air at T = 293 K according to the following experimental data:
Acid concentration, kmol/m3 0.0 0.021 0.05 0.104
σ•10 3 , N/m 72.53 68.12 63.53 58.60
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