Hydrogen sulfide gas is an extremely toxic (and smelly) gas that can form from anaerobic digestion...

Hydrogen sulfide gas is an extremely toxic (and smelly) gas that can form from anaerobic digestion (e.g. in sewer pipes). The ΔG_f^° of H₂S (g) and H₂S (aq) are -33.4 kJ/mol and -27.87 kJ/mol, respectively so that K^H = 9.32 atm/(mole/L) at 25 C. At concentrations above 0.01 ppm in the air, the rotten egg smell is first noticeable. At concentrations above 2 ppm, the gas becomes toxic. Calculate the pH of water in equilibrium with H₂S at 0.01 ppm and 2 ppm.

H₂S gas will dissolve into water according to:

H₂S (g) = H₂S (aq) K^H = 9.32 atm/mol/L

H₂S (aq) will also dissociate as a weak acid according to:

H₂S = H⁺ + HS^- K_a1 = 10^-7

HS^- = H⁺ + S^2- K_a2 = 10^-11

Solutions

Expert Solution

queen_honey_blossom answered 1 year ago

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