sal ammoniac

sal ammoniac

noun Chemistry.

Origin:
1300–50; Middle English

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Collins
World English Dictionary
sal ammoniac
 
n
another name for ammonium chloride

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sal ammoniac   (sāl ə-mō'nē-āk')  Pronunciation Key 
See ammonium chloride.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

sal ammoniac

the salt of ammonia and hydrogen chloride. Its principal use is as an electrolyte in dry cells, and it is also extensively employed as a constituent of galvanizing, tinning, and soldering fluxes to remove oxide coatings from metals and thereby improve the adhesion of the solders. It is a component of many proprietary cold medicines and cough remedies. Ammonium chloride is a colourless, crystalline substance. It is highly soluble in water, readily forming a slightly acidic solution. It vaporizes without melting at 340 C (644 F) to form equal volumes of ammonia and hydrogen chloride. Ammonium chloride is yielded as a by-product in the ammonia-soda process for making sodium carbonate. It also is produced by reaction of ammonium sulfate and sodium chloride solutions

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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