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nature : acid and alkali (base), the concept is closely linked. With the continuous development of chemistry, acid-base concept is evolving. By early litmus Weisuanmei can redden the material known as acid and alkali is able to react with acid to eliminate sourness make litmus turns blue material. The late 19th century theory of ionization Arrhenius put aqueous solution of the ionization of H + cation are substances known as acid, which in aqueous solution of ionizing anions are OH-called base material. 1923 Calculation in Br φ nsted Lowry and the proton theory that whatever can be released any hydrogen protons or ions are molecules acid, alkali and is able to combine elements of proton or ion. Can be applied to non-aqueous system, to be inorganic chemistry and analytical chemistry preference. Also in 1923 Lewis (Lewis) : acid to accept electronic body, alkali electronic right donor. Proton theory than more extensive and can be applied to coordination chemistry and organic chemistry. 1963 R. P. Pearson also called Hard Acid, Lewis acid (Lewis'acid) into soft, acid, alkali Louis (Lewis'base) into hardware and software base, in coordination compounds of applied research.
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