How will you prepare SO2 from H2SO4

How will you prepare SO2 from H2SO4

Grade:Upto college level

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
Sulphur dioxide is usually made in the laboratory by heating concentrated sulphuric acid with copper turnings.
Cu + 2 H2SO4 ==> CuSO4 + SO2 + 2 H2O
Sulphur dioxide is also reduced when heated with mercury, silver or charcoal, C. Reduction with Sulphur, S, is very slow.

Sulphur dioxide is released by the action of acids on sulphites or acid sulphites (e.g. by dropping concentrated sulphuric acid into a concentrated solution of sodium hydrogen sulphite)
.NaHSO3 + H2SO4 ==> NaHSO4 + SO2 + H2O

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