Which part of the surface tension vs log concentration plot is indicative of the adsorption density of the surfactant at the air liquid interface? Plateau surface tension above CMC Slope of the surface tension vs log concentration plot Concentration at which surface tension is lowered by 20 dynes /cm Surface tension at CMC John was using C12 alkyl sulfate at a concentration of 9mM for an application involving adsorption at the air -water interface. Because of supply chain issues, John was asked to replace the C12 sulfate with a C10 sulfate for his application. What is a good estimate of the concentration for the C10 sulfate to provide similar benefit as the C12 sulfate? 27mM9mM3MM81mM