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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

There is one drawback to the use of sulphurous acid solution, and that lies in the proximity of the limits of the quantities necessary for coagulation and that which is in excess, and prevents coagulation.

From The Preparation of Plantation Rubber by Sidney Morgan

Curious is it that sulphurous acid is puzzling to the experimentalist for cloud formation.

From Meteorology or Weather Explained by J. G. M'Pherson

A salt of sulphurous acid in which the base replaces but half the hydrogen of the acid; an acid sulphite.

From Webster's Unabridged Dictionary (2nd 100 Pages) by Noah Webster

Hydrochloric acid is said to frequently issue from the crater; the gases that were most abundant appeared to be sulphurous acid and steam.

From Etna A History of the Mountain and of its Eruptions by G. F. Rodwell

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