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

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

This much is known, that the color and odor are removed by fuming sulphuric acid.

From Scientific American Supplement, No. 401, September 8, 1883 by Various

Toluene treated with fuming sulphuric acid first yields o- and p-sulphonic acids, finally o- and p-disulphonic acids, ethylbenzene at the boiling point p-ethylbenzene-sulphonic acid.

From Synthetic Tannins by Grasser, Georg

Schröter has made similar investigations on the action of strongly fuming sulphuric acid on acetylene.

From Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power by Leeds, F. H. (Frank Henley)

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

From Synthetic Tannins by Grasser, Georg