sodium peroxide

noun Chemistry.
a yellowish-white, hygroscopic, water-soluble powder, Na 2 O 2 , used chiefly as a bleaching agent and as an oxidizing agent.
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World English Dictionary
sodium peroxide
 
n
a yellowish-white odourless soluble powder formed when sodium reacts with an excess of oxygen: used as an oxidizing agent in chemical preparations, a bleaching agent, an antiseptic, and in removing carbon dioxide from air in submarines, etc. Formula: Na2O2

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American Heritage
Medical Dictionary

sodium peroxide n.
A yellowish-white powder used as a germicide, an antiseptic, and a disinfectant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The other two sample preparation methods investigated were a sodium peroxide
  fusion method and a pressure-bomb digestion method.
Reacts violently with sodium peroxide, chromyl chloride, phosphorus trioxide.
The sodium peroxide fusion method adds too much sodium to the sample to allow
  an accurate sodium determination.
Another bleach employs sodium peroxide with acid for pH control.
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