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alkali reaction

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  • Acid-alkali reaction — An acid alkali reaction is a special case of an acid base reaction, where the base used is also an alkali. When an acid reacts with an alkali it forms a metal, salt and water. Acid alkali reactions are also a type of neutralisation reaction.In… …   Wikipedia

  • Alkali Silica Reaction — (ASR) is a reaction between reactive silica (in the concrete aggregates) and an alkali (usually present in the cement), which results in the formation of a gel. This gel increases in volume with water and exerts expansive pressure on the concrete …   Wikipedia

  • Alkali soils — Alkali, or alkaline, soils are clay soils with a relatively high exchangeable sodium percentage, a relative high pH (> 9), a poor soil structure and a low infiltration capacity. Often they have a hard calcareous layer at 0.5 to 1 m. depth (in… …   Wikipedia

  • Alkali-aggregate reaction — is a reaction which occurs over time in concrete between the highly alkaline cement paste and non crystalline silicon dioxide, which is found in many common aggregates. This reaction can cause expansion of the aggregate, leading to spalling and… …   Wikipedia

  • alkali metal — Chem. any of the group of univalent metals including potassium, sodium, lithium, rubidium, cesium, and francium, whose hydroxides are alkalis. [1880 85] * * * Any of the six chemical elements in the leftmost group of the periodic table (lithium,… …   Universalium

  • Alkali metal — Group → 1 ↓ Period 2 3 Li 3 …   Wikipedia

  • Alkali hydroxide — The alkali hydroxides are a class of chemical compounds which are composed of an alkali metal cation and the hydroxide anion (HO ). The alkali hydroxides are: *Lithium hydroxide (LiOH) *Sodium hydroxide (NaOH) *Potassium hydroxide (KOH) *Rubidium …   Wikipedia

  • reaction — 1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with substances such as acids or alkalies; also the property that such substances… …   Medical dictionary

  • ion-exchange reaction — ▪ chemical reaction Introduction       any of a class of chemical reactions between two substances (each consisting of positively and negatively charged species called ions (ion)) that involves an exchange of one or more ionic components.… …   Universalium

  • acid–base reaction — ▪ chemistry Introduction       a type of chemical process typified by the exchange of one or more hydrogen ions, H+, between species that may be neutral (molecules, such as water, H2O; or acetic acid, CH3CO2H) or electrically charged (ions, such… …   Universalium

  • Varrentrapp reaction — The Varrentrapp reaction is an organic reaction involving the chemical decomposition of an α,β unsaturated acid into two other acid fragments by action of molten alkali. This reaction pioneered by F. Varrentrapp in 1840 [F. Varrentrapp, Ann., 36 …   Wikipedia

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