a. For 1, 1-dichloroethane, benzene, perchloroethylene (tetrachloroethylene), an

Question

a. For 1, 1-dichloroethane, benzene, perchloroethylene (tetrachloroethylene), and methyl t-butyl ether, find a value for the Henry's Law Constant H for each of the four compounds in units of atm/(mol/m^3) at 25 C and provide the source. Document the locations where you find these data. Compute the values of H/RT, the "dimensionless" Henry's Law Constant. b. Say the volume of V_W water is fixed at 1 m^3. Prepare plots of f_air (fraction) in air phase vs. log V_a (all four compounds on the plot) log f_air (log fraction) in gas phase vs. log V_a (all four compounds on the plot) You can make two x axes, one for log V_2 and one for log V_2/V_w. Vary the air compartment V_a from 0.01 m^3 to 100,000 m^3. Note that this is not an example of dynamic purging ... this is a static box model example. For each compound, locate where f_air = 0.5. In each case, for the situation when f_air = 0.5, make sense of values of H/RT, V_a/V_w, and (H/RT) (V_a/V_w).

Explanation / Answer

Step I

You can check the values for the given compounds at this site -

https://sd.water.usgs.gov/nawqa/vocns/rathbunfigs.pdf

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