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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 fumaroles were almost all on the brims of the craters, with emanations of hydrochloric and sulphurous acid.

From The Eruption of Vesuvius in 1872 by Palmieri, Luigi

The fire, in burning, turns into gases, which are rank poison—carbonic acid, for one; sulphurous acid, for another.

From Harper's New Monthly Magazine, Vol. 2, No. 8, January, 1851 by Various

The fumes from a well-regulated sulphur furnace should contain from 15 to 16 per cent sulphurous acid.

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

After bleaching with peroxide and drying, the straw consequently undergoes a further process of sulphuring, i.e. exposure to gaseous sulphurous acid.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1 "Bisharin" to "Bohea" by Various

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