146. Solving a chemistry problem

146. Solving a chemistry problem

13. Calculate the adsorption of valeric acid at the interface between aqueous solution and air (at T = 293 K) and the solution concentration
C = 0.0206 kmol / m 3, if the dependence of the surface tension of the solution on the concentration is represented by the following experimental data:
 
 
C, kmol / m 3 0.0 0.0103 0.0206 0.0683 0.2049
σ · 10 3, N / m 72.53 65.45 59.78 49.31 35.20