Hydrogen Sulfates

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hydrogen Sulfates

 

acid salts of sulfuric acid, H2S04—for example, NaHS04. Only hydrogen sulfates of alkaline metals are known. They are produced by moderate heating of sulfates with sulfuric acid: K2S04 + H2S04 = 2KHS04. Potassium and sodium hydrogen sulfates lose water upon melting, turning into pyrosulfates—for example, 2KHS04 = K2S207 + H20. Upon further heating, the pyrosulfates break down: K2S207 = K2S04 + S03. This fact is used to make soluble the strongly annealed oxides of aluminum, chromium, and iron, which are insoluble in acids and which, when melted with hydrogen sulfates (or pyrosulfates), are transformed into sulfates—for example: A1203 + 3K2S207 = A12(S04)3 + 3K2S04.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.