disulphuric acid


From The Collaborative International Dictionary of English v.0.48:

Disulphuric \Di`sul*phu"ric\, a. [Pref. di- + sulphuric.]
   (Chem.)
   Applied to an acid having in each molecule two atoms of
   sulphur in the higher state of oxidation.
   [1913 Webster]

   Disulphuric acid, a thick oily liquid, H2S2O7, called
      also Nordhausen acid (from Nordhausen in the Harts,
      where it was originally manufactured), {fuming sulphuric
      acid}, and especially pyrosulphuric acid. See under
      Pyrosulphuric.
      [1913 Webster]
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