: Paleoclimatology: acid

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acid

An acid is an inorganic or organic chemical compound acceptor, in the broad sense, of electron pairs. It is generally defined by typical reactions in different solvents, in particular by releasing the hydronium ion in water. Acids often react by releasing energy with other chemical compounds called bases, which give electron pairs and have the power to generate, in whole or in part, the hydroxyl ion in water. Strong acids, in a given solvent medium, initiate complete and rapid reactions, transforming the solvent into its most acidic form; weak acids contribute to balanced reactions. The existence of several acid functionalities within the same chemical compound characterizes polyacids. Under the Brønsted-Lewis theory, the pH of a solution obtained by dissolving an acid in water is less than seven. The term acid also applies to magmatic rocks containing 63% or more by mass of SiO2, hence the general presence of quartz crystals, and poor in major elements, Mg, Fe, Ca, etc. (Adapted and translated from: https://fr.wikipedia.org/wiki/Acide and Foucault A., Raoult J.-F., Platevoet B. & Cecca F. (2020). Dictionnaire de Géologie. Dunod (9e édition).)

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