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Definition of pyrosulphuric acid in English:
pyrosulphuric acid
(US pyrosulfuric acid)
noun
ChemistryA crystalline oxyacid of sulphur which is a powerful protonating agent and a major component of fuming sulphuric acid or oleum.
Formula: (HO)₂SO₂·O·SO₂(OH)₂.
Origin
Mid 19th century.
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