Surface tension of weakly ionizable surfactants such as oleic acid or lauric acid show a minimum in surface tension as a function of pH. Why does surface tension increase with decreasing in pH below the pH of minimum surface tension? Fatty acid ionizes at low pH and the charge repulsion increases with decreases in pH Acid soap formation increases with decrease in pH below the pH of minimum surface tension Fatty acid formed upon protonation has lower surface activity Fatty acid precipitates and therefore soluble surfactant decreases in solution When an emulsion is made from a large droplet of oil in water by overhead stirrers, which of the following statements regarding the emulsion is true? Volume of a single final droplet will be same as volume of a single initial droplet Sum of radii of all droplets will be equal to radius of initial droplets Sum of mass of all final droplets will be same as the sum of mass of the initial droplets Sum of surface area of all final droplets will be smaller than the initial surface area