17. Calculate the specific adsorption of heptanoic acid and construct an adsorption isotherm according to the dependence σ=f(c) for its aqueous solutions at T = 293 K.
c*10, mol/m3 σ*103, N/m c*10, mol/m3 σ*103, N/m c*10, mol/m3 σ*103, N/m
0 72.75 1.585 69.70 5.012 61.80
0.100 72.40 1.995 68.40 6.310 60.10
0.398 72.00 2.512 67.00 7.943 58.40
1,000 71.20 3,162 65.30 10,000 56.70
1.259 70.60 3.981 63.60

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