Oleum
From Wikipedia, the free encyclopedia.

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.

The original article can be found at: http://en.wikipedia.org/wiki/Oleum.
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