Copper wire was introduced into the heated concentrated sulfuric acid and the evolved gas was passed through

| April 4, 2021 | education

Copper wire was introduced into the heated concentrated sulfuric acid and the evolved gas was passed through an excess of sodium hydroxide solution. The solution was carefully evaporated, the solid residue was dissolved in water and heated with powdered sulfur. Unreacted sulfur was separated by filtration and sulfuric acid was added to the solution, while the formation of a precipitate and the evolution of gas with a pungent odor were observed. Write the equations for the described reactions.

2 H2SO4 + Cu → CuSO4 + SO2 ↑ + 2 H2O.
SO2 + 2 NaOH → Na2SO3 + H2O.
Na2SO3 + HOH → NaHSO3 + NaOH.
3 S + 6 NaOH → 2 Na2S + Na2SO3 + 3 H2O.
Na2S +2 H2SO4 → S ↓ + SO2 ↑ + Na2SO4 + 2 H2O.

The released gas has a very strong odor, but has no color and is poisonous. It is 2 times heavier than air. Let’s dissolve in water.



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