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Question: 1) The purpose of this exercise is to determine the experimental value of the diffusion coefficie…

Question: 1) The purpose of this exercise is to determine the experimental value of the diffusion coefficie...
Question: 1) The purpose of this exercise is to determine the experimental value of the diffusion coefficie...

1) The purpose of this exercise is to determine the experimental value of the diffusion coefficient sodium chloride through a cellulose membrane. Refer to Figure 1 for the experimental set-up. Initially, v 100 cm of sodium chloride aqueous solution with a concentration of5 mollL is placed in the small cup. A cellulose membrane forms the base of the cup and sodium chloride begins to diffuse through it to the volume V2 below. Volume pure water and is continuously replenished so it may be assumed that the salt concentration at any time is effectively zero. As time goes on, the concentration of NaCl in V decreases. This is an unsteady-state process. During the experiment, the electrical conductivity of the solution in v is measured and a calibration curve of conductivity versus Nacl concentration is used to prepare data of NaCl concentration in V as a function of time. These data are in the file EXCEL Exercise 3 Data S17 that you can find in the assignments folder of the course canvas site. You will use these data to find the effective diffusion coefficient Def of NaCl through the membrane. conductivity membrane water out Figure 1 Experimental set-up We will neglect convective resistances on both sides of the membrane and consider the only resistance to mass transfer to be in the membrane itself This results in a mass transfer model:

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