Reagente

Reagente is the term used in Portuguese and Spanish for a substance that participates in a chemical reaction or is used to cause, test, or measure a reaction. In practice, reagents cover a broad range of materials, including reactants that are consumed during a reaction, as well as substances added to drive a reaction, act as catalysts, or facilitate analysis. The concept is parallel to the English word “reagent.”

Reagents can be pure chemicals, mixtures, or solutions prepared at specific concentrations. They are chosen for their chemical behavior, compatibility with solvents, and the desired outcome of an experiment or process. Common classes include oxidizing reagents (for example, potassium permanganate), reducing reagents (such as sodium borohydride), acids and bases (for instance, hydrochloric acid and sodium hydroxide), and complexing or chelating agents (like EDTA). In analytical chemistry, reagents are often used for detection, titration, or colorimetric assays and may include indicators and reference materials.

Quality and safety are important considerations. Reagents are supplied with specified purities, sometimes labeled as ACS reagent, HPLC-grade, or other grades appropriate to the application. Higher purity reagents reduce the risk of interference in measurements and reactions but may be more expensive. Proper storage, labeling, and hazard information are essential, along with appropriate handling, personal protective equipment, and adherence to waste disposal regulations.

Terminology and usage vary by language and context. In everyday laboratory practice in Portuguese- or Spanish-speaking settings, reagente refers to any chemical used to participate in or drive a reaction, as well as those used for analysis. Catalogs and supplier specifications typically organize reagents by chemical identity, grade, and intended application.