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sulphurous acid

British  

noun

  1. Systematic name: sulphuric(IV) acid. an unstable acid produced when sulphur dioxide dissolves in water: used as a preservative for food and a bleaching agent. Formula: H 2 SO 3

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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In the manufacture of starch, the corn is first "soaked" or "steeped" in a dilute sulphurous acid water for approximately 36 hours.

From Time Magazine Archive

The best practical antiseptic for sanitary purposes is cleanliness; the best disinfectants are heat, bichloride of mercury, sulphate of iron, chloride of zinc, sulphurous acid, chlorine, sunlight, and pure air, and, for yellow fever, cold.

From A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases by Various

I should not feel confident as to the thorough disinfection by sulphurous acid of the hold of an infected ship unless the fumes had been applied for sixty hours.

From A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases by Various

Hydrosulphites, unlike sulphurous acid, will bleach equally as well in alkaline or neutral medium, as in an acid medium.

From The Philippine Agricultural Review Vol. VIII, First Quarter, 1915 No. 1 by Various

The compound is readily prepared by the action of sulphurous acid or any other reducing agent on the quinone.

From Coal and What We Get from It by Raphael Meldola

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