2 HPO3 Sulphur trioxide is more conveniently on the small scale by distilling fuming sulphuric acid in a retort and collecting the sulphur trioxide in a perfectly dry receiver cooled in a freezing mixture. Sulphur trioxide reacts vigorously with water to form sulphuric acid. H2SO4 Sulphur trioxide reacts with water vapour in the air to form white fumes consisting of tiny droplets of sulphuric acid. Sulphur trioxide readily reacts with basic oxides to form sulphates. Sulphur trioxide is a planar covalent molecule with one sulphur oxygen double bond and with a bond angle of 120 degrees between the other two oxygen atoms.
Sulphur trioxide has a resonance structure.
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