Consider h2s which is a diprotic acid (gives off 2 protons when dissolved in water). you are working with a porewater sample from ballona wetland sediments. porewater is the water found in the pores between sediment particles. as these sediments are anoxic, they have high levels of h2s. the stotal concentration ([h2s] + [hs-] + [s2-]) in the porewater is 20 mg/l as s (assume the molecular weight is that of sulfur.) the henry’s law constant for h2s is 10-0.99 m/atm. a. solve for the fraction of h2s in the water as a function of ph. show your work to derive the equation. b. use excel to graph fh2s vs. ph. c. if the ph of the sample is 7.5, what is the partial pressure of h2s in the air directly above the water sample (assume equilibrium)? d. use the partial pressure of h2s to find the concentration of the h2s in the gas phase (mg/l). hint: think about the relationship between pressure, moles, and volume for gases. e. the odor threshold (concentration at which you can smell the gas) for h2s is 8 ppmv. find the concentration of h2s in the gas phase in ppmv. note that your answer in part d is a good place to start. think about how to convert mg/l to l/l for a gas. based on the odor threshold, will you be able to smell h2s?