AskDefine | Define reagent

Dictionary Definition

reagent n : a chemical agent for use in chemical reactions

User Contributed Dictionary



  • /ɹi.'eɪ.dʒɛnt/


  1. A usually available or readily made compound or known mixture of compounds used to treat materials, samples, other compounds or reactants in a laboratory or sometimes an industrial setting.


substance used in chemical reactions
  • Catalan: reactiu
  • French: réactif
  • Ido: reaktivo
  • Italian: reagente
  • Spanish: reactivo
  • Turkish: reaktif

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Extensive Definition

A reagent or reactant is a substance or compound consumed during a chemical reaction. Solvents and catalysts, although they are involved in the reaction, are usually not referred to as reactants.
Although the terms reactant and reagent are often used interchangeably, reagent is often used in a more specialized sense as "a test substance that is added to a system in order to bring about a reaction or to see whether a reaction occurs". Examples of such analytical reagents include Fehling's reagent and Tollens' reagent. In organic chemistry, reagents are compounds or mixtures, usually composed of inorganic or small organic molecules, that are used to effect a transformation on an organic substrate. Examples of organic reagents include the Collins reagent, Fenton's reagent, and Grignard reagent.
In another use of the term, when purchasing or preparing chemicals, "reagent-grade" describes chemical substances of sufficient purity for use in chemical analysis, chemical reactions or physical testing. Purity standards for reagents are set by organizations such as ASTM International. For instance, reagent-quality water must have very low levels of impurities like sodium and chloride ions, silica, and bacteria, as well as a very high electrical resistivity.


reagent in Arabic: كاشف كيميائي
reagent in Catalan: Reactiu
reagent in German: Edukt
reagent in Spanish: Reactivo
reagent in French: Réactif (chimie)
reagent in Indonesian: Pereaksi kimia
reagent in Italian: Reagente
reagent in Hebrew: מגיב
reagent in Lithuanian: Reagentas
reagent in Dutch: Reactant
reagent in Japanese: 試薬
reagent in Polish: Reagent
reagent in Portuguese: Reagente químico
reagent in Slovenian: Reagent
reagent in Thai: รีเอเจนต์
reagent in Ukrainian: Реагенти
reagent in Chinese: 反应物

Synonyms, Antonyms and Related Words

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