Give a balanced equation for the formation of sulphurous acid.
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SO2 + H20-------> H2SO3
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Chemical properties: Sulfurous acid is unstable, and has never been isolated in its pure state. It decomposes readily into water and sulfur dioxide:
H2SO3 (aq) → H2O + SO2
It also forms sulfuric acid when exposed to air:
2H2SO3 + O2 → 2H2SO4
Sulfurous acid is a weak and dibasic acid. It reacts with bases to form bisulfite and sulfite salts.
2H2SO3 + O2 → 2H2SO4
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