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by: Opeoluwa Oyeleke

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Opeoluwa Oyeleke

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Organic Chemistry I
Dr. Saha
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"Loved these! I'm a horrible notetaker so I'll be your #1 fan in this class"
Leatha Dickens

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This 4 page Bundle was uploaded by Opeoluwa Oyeleke on Saturday January 30, 2016. The Bundle belongs to CHM at University of South Florida taught by Dr. Saha in Fall 2014. Since its upload, it has received 21 views.


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Loved these! I'm a horrible notetaker so I'll be your #1 fan in this class

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Date Created: 01/30/16
Experiment A: MEMBRANE DIFFUSION Date of Submission: 11/09/2015 Lab Session: Group 2, Section 1 (Monday) Group Members: Hayat Soufani, Opeoluwa Oyeleke, Samantha Norman, Roberto Infante    DATA ANALYSIS 1. Use your calibration data to calculate a molar conductance Am for each probe. CALIBRATION DATA Probe D.I water NaCl solution Conc. in H2O Conc. in NaCl (µs/cm) (µs/cm) (g/L) (g/L) 1 5 1262 0 0.5 2 11 1249 0 0.5 3 7 1204 0 0.5 Molar conductance is calculated for each probe using the formu a: . Formula  gotten from Wikipedia. ● represents the measured conductivity in micro Siemens per centimeter (µs/cm) ● C represents the concentration of the electrolyte in g/L To calculate the molar conductance in its proper units, Siemens per meter per molarity (s/m*M),  the concentration of the electrolyte has to be converted to units of molarity (M) or (mol/L) and  the units of the measured conductivity to Siemens per meter. Probe Electrolyte  Conductivity (s/m) concentration (mol/L) (s/m∗M) 1 0.008556 0.1262 14.75 2 0.008556 0.1249 14.60 3 0.008556 0.1204 14.07 SAMPLE CALCULATIONS  Converting units of concentration of electrolyte solution:  M here represents the molar mass of the electrolyte solution in g/mol When C = 0.5 g/L and M = 58.44 g/mol,  Converting units of measured conductivity:  When k is 1200 micro Siemens per centimeter,  Calculating the molar conductance: As mentioned above, molar conductance  Using the values converted to appropriate units above,  2. Use the molar conductance along with EXCEL to convert all measured conductivities from your  three runs to salt concentrations.   Using the same method applied for conversions in part1, the measured conductivities are  converted to salt concentrations. The formula for molar conductance is rearranged to one that calculates salt concentration.   The measured is firstly converted to its appropriate units in Siemens per meter (s/m) and  divided by the corresponding value of molar conductance calculated for each probe in part 1.  Resulting conversions are in EXCEL spreadsheet (Parts 2­6) 3. Truncate your data sets by removing the data before the cup was lowered into the bath.  The data sets gotten from the experiment was truncated by removing the first four measured  data points. Resulting data is in second sheet of EXCEL labeled (Parts 2­6) 4. Redefine the time columns so that t=0 corresponds to when the cup was placed in the bath.  Implemented in previous number (3). Resulting data in EXCEL spreadsheet (Parts 2­6) 5. Evaluate Deff for each of the membranes tested.  Deff was evaluated after C∞ and b were evaluated for each probe. The sum of squared errors  was used to evaluate both values using the measured C2 and theoretical C2 using the formula provided below:  Using this formula to evaluate C2 at every time for initial guesses of C∞ and b, the sum of  squared errors is used to evaluate the best values for C∞ and b. Probe C∞ b 1 0.001736 10.00 2 0.001751 10.00 3 0.001738 10.00 The formula below is then rearranged to solve Deff using the value of b evaluated for the  probes initially. Where  represents the thickness of the dialysis membrane; And A represents the area of the membrane. Thickness Probe (cm) Deff (cm /s) 1 0.0025 0.008838 2 0.003 0.01061 3 0.00225 0.007955 6. Find, any way you wish including SOLVER in EXCEL, the best values of C∞ and b in Equation  (9) for each membrane. 7. Use equations 7  8. For each probe,  9. Knowing


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