Sciencemadness Discussion Board - Hydrogen Sulfide and Sulfur Dioxide Reaction

Hydrogen Sulfide and Sulfur Dioxide Reaction

hodges - 14-1-2023 at 18:05

2H2S + SO2 --> 2H2O + 3S

But under what conditions?

I generated these two gasses in separate test tubes adding dilute HCl to FeS and Na2S2O3. I could definitely smell both from near the test tubes. I brought the test tubes together, under a bright light so I could see any precipitating S in the air. I was thinking this would work similar to the reaction between HCl and NH3 to produce a cloud. But no cloud whatsoever.

I'm guessing maybe both gasses have to be dissolved in water for this to work?

Rainwater - 14-1-2023 at 18:42

Thermodynamics says it should work

Code:

	ΔH	-234.4965	kJ/mol
	ΔS	-424.0484	J mol/K
	temp	293.15	Kelvin 
		20	Celsius 
			
	ΔG = ΔH - TΔS		
	ΔG	-110.19	kJ/mol
	ΔG=0   T=	552.99 K	279.84 C

The colder the better, but that would go against kinetics.

Maybe dissolve the gasses in a solvent?