reagent
In chemistry, a reagent or reagent is a substance that shows a specific reaction when it comes into contact with certain other substances . A distinction is made between detection reagents and synthesis reagents .
Detection reagent
In analytics , a reagent is a substance that is used to identify another substance, i.e. H. a means of detection in a detection reaction . The addition of the reagent leads to a chemical reaction with the formation of a characteristic precipitate or color change, which allows conclusions to be drawn about the presence or absence of certain ions or functional groups . Many reagents are named after their developer or discoverer, e.g. B. Fehling's solution or Bettendorf's reagent .
If a reagent can only be used to clearly identify its membership in a certain group of substances , it is called a group reagent .
Synthesis reagent
In synthetic chemistry , the term reagent, especially in older literature, denotes a substance that is used to modify a reactant and is consumed during the reaction; one example is the Grignard reagent . In this case it is used synonymously with educt and should therefore be avoided according to IUPAC .
Web links
Individual evidence
- ^ IUPAC. Compendium of Chemical Terminology, 2nd ed. (The "Gold Book") doi : 10.1351 / goldbook.R05190 .