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salt cake

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salt cake

–noun Chemistry.
an impure form of sodium sulfate, esp. as obtained by the interaction of sulfuric acid and common salt in the synthesis of hydrochloric acid: used chiefly in the manufacture of glass, ceramic glazes, soaps, and sodium salts.

Origin:
1695–1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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salt cake  
n.  Impure sodium sulfate used in making paper pulp, soaps and detergents, glass, ceramic glazes, and dyes.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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