The Oleum reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Oleum

Oleum is also known as fuming sulphuric acid or Nordhausen acid. It has a chemical formula of H₂S₂O₇, and can be formed by dissolving excess sulphur trioxide into sulphuric acid. See sulphuric acid for more information.

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