A chemical transport barge routinely carries chemicals across Lake Futura. In an unfortunate incident the chemical transport barge, carrying a solution of phenol in synthetic oil, which is non-volatile and denser than water, developed a leak, which resulted in an oil spill equivalent to about 0.015% of the lake volume.

i. You are asked to develop a simple model that will enable one to predict the concentration of phenol in the water phase as a function of time (numerical calculations are not required).

ii. Sketch the phenol concentration in the water and oil phases as a function of time.