#bases
- Ader — A proper name used as a surname or given name across various cultural spaces, with Germanic or Hebrew origins; it can also designate geographical entities, such as the Ader River, or prominent historical figures (such as Clément Ader, a French aviation pioneer). In a structural context, the name reflects specific genealogical identities, integrated into international onomastic and historical databases.
- Alkali — A generic name given to the hydroxides of alkali metals (such as sodium, potassium) and alkaline earth metals, as well as ammonium hydroxide. In a traditional chemical sense, it refers to any water-soluble base capable of neutralizing acids, turning red litmus paper blue, and forming salts through combination reactions.
- Alkalimetric — Pertaining to alkalimetry; based on the measurement of alkalinity or the concentration of bases in a solution. The term describes the methods, instruments, or reagents utilized in quantitative titration analyses, where the volume of a standard acid of known concentration determines the purity of the analyzed alkaline substance.
- Alkalimetry — A method of quantitative volumetric analysis that consists of determining the concentration of a base or the amount of free alkaline substance in a solution by progressive titration with an acid solution of known concentration (standard acid). The process uses acid-base indicators or potentiometric methods to highlight the chemical equivalence point where neutralization is complete.
- Alkalimeter — An apparatus or laboratory instrument utilized in volumetric chemical analyses to measure the amount or concentration of free bases (alkali) in a liquid mixture. Historically, the term referred to special graduated glass vessels (early burettes), while in a modern context, it can describe automatic titration modules configured for basic determinations.
- Aldimines — A class of nitrogenous organic compounds formally derived from an aldehyde, by replacing the carbonyl oxygen atom with an imino group (=N-R or =N-H). These represent secondary imines or Schiff bases with the general structure R-CH=N-R', serving as highly valuable intermediates in fine organic synthesis, drug manufacturing, and enzymatic biochemistry.
- Amidine — An organic compound functionally derived from a carboxamide where the oxo group (=O) has been replaced by an imino group (=NR), having the general structure R-C(=NR)-NR2. Amidines are structurally recognized as strong organic bases due to the resonance stabilization of the cation resulting from protonation, their core being frequently used in the synthesis of antiparasitic, antifungal drugs, and clinical diagnostic agents.