EMA4121_HW3_Solutions

1 nacl solution is 7293 mjm a plot the data and use

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Unformatted text preview: tion is 72.93 mJ/m . a. Plot the data and use the Gibbs adsorption isotherm equation to calculate the surface excess concentration of SDS, ΓSDS, in molecules per 1000 Å2 for each concentration. Plot γ vs concentration and find linear regression with intercept=72.93. Slope = -23.295 mJ/m2mM. Then, calculate ΓSDS for each concentration. ( ) ( ( )( )( ) ( ) Where c is the concentration of SDS at a particular data point. See Excel file for data and plot. b. Plot the spreading pressure, ΠS versus effective area per molecule, a0, and plot the compressibility factor (ΠS a0/kT) versus spreading pressure for this system. Comment on the deviation from ideality. This part of the problem was dropped from the problem set. )...
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