Share on Facebook Share on Twitter Email
Answers.com

anhydride

 
Dictionary: an·hy·dride   (ăn-hī'drīd') pronunciation
Home > Library > Literature & Language > Dictionary
n.
A chemical compound formed from another, often an acid, by the removal of water.

[ANHYDR(OUS) + -IDE.]


Search unanswered questions...

Enter a question here...
Search: All sources Community Q&A Reference topics

Chemistry Dictionary: anhydride
Top
Home > Library > Science > Chemistry Dictionary

A compound that produces a given compound on reaction with water. For instance, sulphur trioxide is the (acid) anhydride of sulphuric acid

SO3+H2O → H2SO4
See also acid anhydrides.


Britannica Concise Encyclopedia: anhydride
Top
Home > Library > Miscellaneous > Britannica Concise Encyclopedia

Any chemical compound obtained, either in practice or in principle, by eliminating water (H2O) from another compound. Examples of inorganic anhydrides are sulfur trioxide, SO3, which is derived from sulfuric acid, H2SO4, and calcium oxide, CaO, which is derived from calcium hydroxide Ca(OH)2. The most important organic anhydride is acetic anhydride, (CH3CO)2O, a raw material for making cellulose acetate (used for films, fibres, and plastic goods) and aspirin. It can be thought of as acetic acid minus water. Organic anhydrides are very important starting materials for organic synthesis, as they can give rise to carboxylic acids, esters, or amides under the proper conditions.

For more information on anhydride, visit Britannica.com.

 
Columbia Encyclopedia: anhydride
Top
Home > Library > Miscellaneous > Columbia Encyclopedia
anhydride (ănhī'drīd, -drĭd) [Gr.,=without water], chemical compound formed by removing water, H2O, from another compound; the anhydride can also react with water to form the original compound. An acid anhydride reacts with water to form an acid; e.g., sulfur trioxide, SO3, reacts with water to form sulfuric acid, H2SO4. A basic anhydride reacts with water to form a base; e.g., calcium oxide, CaO, reacts with water to form calcium hydroxide, Ca(OH)2. Anhydrides of organic acids have many uses. They react with alcohols to form esters; e.g., acetic anhydride, (CH3CO)2O, reacts with ethanol, C2H5OH, to form ethyl acetate, CH3COOC2H5, a useful solvent. They also react with ammonia and primary or secondary amines to form amides. Other important acid anhydrides include maleic anhydride and phthalic anhydride.

Veterinary Dictionary: anhydride
Top
Home > Library > Animal Life > Veterinary Dictionary

A compound derived from an acid by removal of a molecule of water.

Shopping: anhydride
Top
acid anhydride more
 
 

 

Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Chemistry Dictionary. A Dictionary of Chemistry. Sixth Edition. Copyright © Market House Books Ltd, 2008. All rights reserved.  Read more
Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/.  Read more
Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.  Read more