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Reagent
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==Definitions== === Organic chemistry === In [[organic chemistry]], the term "reagent" denotes a chemical ingredient (a compound or mixture, typically of inorganic or small organic molecules) introduced to cause the desired transformation of an organic substance. Examples include the [[Collins reagent]], [[Fenton's reagent]], and [[Grignard reagent]]s. === Analytical chemistry === In [[analytical chemistry]], a reagent is a compound or mixture used to detect the presence or absence of another substance, e.g. by a color change, or to measure the concentration of a substance, e.g. by [[Colorimetry (chemical method)|colorimetry]]. Examples include [[Fehling's reagent]], [[Millon's reagent]], and [[Tollens' reagent]].
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