Write the reaction equation: S-H2S-SO2-Na2SO3

Molten sulfur reacts with hydrogen to form hydrogen sulfide. Hydrogen sulfide is a gas with a characteristic rotten egg smell. Toxic.

S + H2 = H2S

Hydrogen sulfide in a sufficient amount of oxygen completely burns out with the formation of water and sulfur dioxide.

2 H2S + 3 O2 = 2 H2O + 2 SO2

Sulfur dioxide, when passed through a sodium hydroxide solution, forms a salt of weak sulfurous acid – sodium sulfite.

2 NaOH + SO2 = Na2SO3 + H2O

Also, sodium sulfite can be obtained by passing sulfur dioxide through sodium carbonate.

Na2CO3 + SO2 = Na2SO3 + CO2

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