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Encyclopedia > Anhydride
Structure of anhydride.

In chemistry, an anhydride is a compound that can be considered as derived from another compound by subtracting the molecules of water. Image File history File links This is a lossless scalable vector image. ... Image File history File links This is a lossless scalable vector image. ... Chemistry - the study of atoms, made of nuclei (conglomeration of center particles) and electrons (outer particles), and the structures they form. ... A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition. ... “HOH” redirects here. ...


For example:

2 NaOH - H2O = Na2O
H2SO4 - H2O = SO3

Thus sodium oxide is an anhydride of sodium hydroxide, and sulfur trioxide is an anhydride of sulfuric acid. Sodium hydroxide (NaOH), also known as lye or caustic soda, is a caustic metallic base. ... Sodium oxide is a chemical compound with the formula Na2O. It is used in ceramics and glasses. ... Sulfuric acid, H2SO4, is a strong mineral acid. ... “SO3” redirects here. ...


Compounds involved are often acids or bases; in such cases, the anhydrides can be called acid anhydrides or base anhydrides. This doesn't imply that the anhydrides aren't themselves acids or bases; they are. But the more hydrated forms may be more familiar or convenient. ACID (Atomicity, Consistency, Isolation, Durability) is a set of properties that guarantee that database transactions are processed reliably. ... Acids and bases: Acid-base reaction pH Self-ionization of water Buffer solutions Systematic naming Acid-base extraction Acidity function Proton affinity Acids: Strong acids Weak acids Superacids Lewis acids Mineral acids Organic acids Bases: Strong bases Weak bases Superbases Lewis bases Organic bases edit In chemistry, a base is... Acid anhydrides are chemical compounds that look like, and sometimes are, the product resulting from dehydration of an acid. ...


"Anhydride" is sometimes used as a synonym for "acid anhydride".


Following are two reactions, one with a typical acid and base, one with their anhydrides. The first one is more practical.

2 NaOH (aq) + H2SO4 (aq) → Na2SO4 + 2H2O
Na2O (s) + SO3 (l) → Na2SO4

In organic chemistry, the compounds most commonly involved are carboxylic acids. Structure of a carboxylic acid The 3D structure of the carboxyl group A space-filling model of the carboxyl group Carboxylic acids are organic acids characterized by the presence of a carboxyl group, which has the formula -C(=O)OH, usually written -COOH or -CO2H. [1] Carboxylic acids are Bronsted...

2 CH3COOH → (CH3CO)2O + H2O

Anhydrides are typically more reactive than their corresponding acids, as they can react with water to form their corresponding acid. They often are good dehydrating agents. Acetic anhydride is useful in the acetylation of salicylic acid, as using acetic acid to do the reaction leaves water behind that can destroy the product, acetylsalicylic acid, or aspirin. Acetic anhydride, also known as ethanoic anhydride, is one of the simplest of acid anhydrides. ... Acetylation describes a reaction, usually with acetic acid, that introduces an acetyl functional group into an organic compound. ... Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. ... Aspirin or acetylsalicylic acid (acetosal) is a drug in the family of salicylates, often used as an analgesic (against minor pains and aches), antipyretic (against fever), and anti-inflammatory. ...


In biology, most of the high energy phosphate compounds are formed from the condensation of the phosphate ion with a phosphorylated sugar. The resulting pyrophosphate bond is a classic anhydride bond. High energy phosphate can mean one of a couple things: It can mean the phosphate-phosphate bonds formed when compounds such as adenosine diphosphate and adenosine triphosphate are created. ... Above is a ball-and-stick model of the inorganic hydrogenphosphate anion (HPO42−). Colour coding: P (orange); O (red); H (white). ... Magnification of grains of sugar, showing their monoclinic hemihedral crystalline structure. ... In chemistry, the anion, the salts, and the esters of pyrophosphoric acid are called pyrophosphates. ...


  Results from FactBites:
 
Trimellitic Anhydride (3286 words)
Trimellitic anhydride is a white and thinly flaked crystalline solid.
Before a worker is placed in a job with a potential for exposure to trimellitic anhydride, a licensed health care professional should evaluate and document the worker's baseline health status with thorough medical, environmental, and occupational histories, a physical examination, and physiologic and laboratory tests appropriate for the anticipated occupational risks.
Clothing contaminated with trimellitic anhydride should be removed immediately, and provisions should be made for the safe removal of the chemical from the clothing.
Anhydride - Wikipedia, the free encyclopedia (254 words)
In chemistry, an anhydride is a compound that can be considered as derived from another compound by subtracting the atoms of water.
Thus sodium oxide is an anhydride of sodium hydroxide, and sulfur trioxide is an anhydride of sulfuric acid.
Acetic anhydride is useful in the acetylation of salicylic acid, as using acetic acid to do the reaction leaves water behind that can destroy the product, acetylsalicylic acid, or aspirin.
  More results at FactBites »

 
 

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