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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

Besides these gases, the atmosphere also contains aqueous vapour in variable quantity, ozone, carbonic acid gas, traces of ammonia, nitric acid, and, in towns, sulphuretted hydrogen and sulphurous acid gas.

From The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli by Various

It is more probable that it arises from the sulphurous acid in its combination with barytes, which may operate as a poison to animals.

From Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas by Schoolcraft, Henry Rowe

As a gaseous disinfectant for rooms, etc. chlorine is superior to sulphurous acid, but it has the disadvantage of injuring metals, is not so easily applied, and is more costly.

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

He went to the bottom of the crater, and observed a slight evolution of sulphurous acid vapors, but the "hornitos" had entirely ceased to send forth steam.

From Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology by Lyell, Charles, Sir

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