fuming sulphuric acid

British  

noun

1. Also called: oleum.   Nordhausen acid.  a mixture of pyrosulphuric acid, H 2 S 2 O 7 , and other condensed acids, made by dissolving sulphur trioxide in concentrated sulphuric acid

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Example Sentences

These hydrocarbons contain only a slight proportion of thiophene and its isomers, which can be removed only by a treatment with fuming sulphuric acid, but this is only exceptionally done.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" by Various

Benzene, for instance, is easily converted into the m-disulphonic acid by gently heating with fuming sulphuric acid; stronger heating converts the m- into the p-disulphonic acid, and at 190° C. the trisulphonic acid is formed.

From Synthetic Tannins by Grasser, Georg

Phosphoruspentoxide or potassium sulphate considerably increase the sulphonating property exhibited by fuming sulphuric acid.

From Synthetic Tannins by Grasser, Georg

Of the three isomeric xylenes o- and m-xylene dissolve in concentrated, p-xylene in fuming sulphuric acid only.

From Synthetic Tannins by Grasser, Georg

Similarly, halogenated compounds and alcohols react with concentrated or fuming sulphuric acid forming sulphonic and hydrosulphonic acids respectively.

From Synthetic Tannins by Grasser, Georg