Surface tension data for a given C14 anionic surfactant in pure water at 25C are fit by the equation y N = 72.0 - 10.8 In 1 + C2 7 where C, is the concentration of the surfactant 3.90-10-5 A. Determine the efficiency of this surfactant B. The surface tension of an extremely concentrated solution of the surfactant is found to be 31.0 mN/m. Estimate the CMC of the surfactant. C. Estimate the pC20 of a similar surfactant that is longer with 16 carbons rather than 14 carbons. D. If a solution of a specific concentration was created in (1) pure water and (2) in salty water, 0.1 M NaCl, how would the surface tension change, qualitatively? Justify your