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Principles of Colloid and Surface Chemistry, Revised and Expanded, 3rd Edition by CRC Press

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EXAMPLE 9.3 Analysis of Adsorption Data Using the Langmuir Isotherm. Slope and intercept values for the linearized plots of the data in Figure 9.7 are as follows:

Temperature (°C)

Slope (g g−1)

Intercept (g g−1)

−15.3

1.9

0.040

    0.0

2.0

0.047

  20.0

2.0

0.088

Note that since p/p0 is used in the linearization, the abscissa is dimensionless and the slope and intercept have the same units. Figure 9.7 suggests that the data at −15.3 and 0.0°C converge to a common saturation value, but this is less clear for the data at 20°C. Do the linear plots clarify this situation? From the temperature dependence of the K’s for these data, estimate the adsorption energy in this system.

FIG. 9.7 Plot showing how the amount of ethyl chloride adsorbed ...

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