alkali


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alkali

(ăl`kəlī) [Arab., al-gili=ashes of saltwort], hydroxidehydroxide
, chemical compound that contains the hydroxyl (−OH) radical. The term refers especially to inorganic compounds. Organic compounds that have the hydroxyl radical as a functional group are called alcohols; the hydroxyl radical is also present in the carboxyl group
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 of an alkali metalalkali metals,
metals found in Group 1 of the periodic table. Compared to other metals they are soft and have low melting points and densities. Alkali metals are powerful reducing agents and form univalent compounds.
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. Alkalies are readily soluble in water and form strongly basic solutions with a characteristic acrid taste. They neutralize acids, forming salts and water. Strong alkalies (e.g., those of sodium or potassium) are sometimes called caustic alkalies. The term alkali originally applied to salts obtained from plant ashes and is sometimes applied to a carbonate of sodium or potassium or to the hydroxide of an alkaline-earth metalalkaline-earth metals,
metals constituting Group 2 of the periodic table. Generally, they are softer than most other metals, react readily with water (especially when heated), and are powerful reducing agents, but they are exceeded in each of these properties by the
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.

Alkali

 

a base in aqueous solution. Aqueous alkaline solutions have high concentrations of OH (hydroxyl) ions. Alkalies include the hydroxides of the alkali metals, the alkaline-earth metals, and ammonium.

Most alkalies are highly hygroscopic white solid compounds. Their dissolution in water is accompanied by the liberation of large amounts of heat. Alkaline solutions change the color of acid-base indicators. The strongest, that is, caustic, alkalies are the hydroxides of the alkali metals, such as NaOH and KOH, while the weakest alkalies are ammonium hydroxide and the hydroxides of the alkaline-earth metals, such as Ca(OH)2 and Ba(OH)2. Also sometimes considered as alkalies are the salts of strong bases and weak acids (seeACIDS AND BASES), whose aqueous solutions exhibit alkaline reactions, for example, the hydro-sulfides NaSH and KSH, the carbonates Na2CO3 and K2CO3, the hydrocarbonate NaHCO3 and the borax Na2B4O7. Alkalies are commonly used in laboratory work and in industry (seeSODIUM HYDROXIDE; POTASSIUM HYDROXIDE; and CALCIUM HYDROXIDE).

alkali

[′al·kə‚lī]
(chemistry)
Any compound having highly basic qualities.
(petrology)

alkali

Any of the various chemically active bases such as the soluble salts of metals, e.g., the water-soluble salts of sodium and potassium which occur in constituents of concrete and mortar that may result in deleterious expansion.

alkali

1. Chem a soluble base or a solution of a base
2. a soluble mineral salt that occurs in arid soils and some natural waters
References in periodicals archive ?
Credit Suisse is acting as financial advisor for both the Cristal and Alkali transactions and Kirkland & Ellis LLP and Willkie Farr & Gallagher LLP are the legal advisors.
Alkali bees from 1 acre of nesting bed "well populated" can readily pollinate 100 or more acres of alfalfa, for a crop of about 100,000 pounds of clean seed, says Cane, with the ARS Pollinating Insect-Biology, Management, Systematics Research Unit in Logan, Utah.
Our intent to sell Alkali comes at an attractive time as the global market for natural soda ash is recovering and prices are improving.
7 million, a previously announced restructuring charge primarily associated with the closure of 433,000 tons of chlor alkali capacity of $92.
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FMC Corporation (NYSE: FMC), a diversified chemical company, has signed a definitive agreement to sell its Alkali Chemicals business to Tronox Limited (NYSE: TROX), a United States-based chemical company.
The Lords Chloro Alkalies Plant, which has been non-functional since 2012, is expected to be reopened in 2014, which is expected to play a significant role in increasing volume production of chlor alkali chemicals in India.
The patient was suspected to have milk alkali syndrome (MAS) and treated accordingly.
Water usually attacks much less vigorously than alkali but attack of water quickly becomes the attack of alkali as alkali is extracted from the glass into the solution to the take part in the reaction.
One of the first studies of alkali activated fly ash concerned the synthesis of zeolites.
South Shields-based Red Square Residential leased the unique property, the Alkali pub on Swinburne Street, from owner Les Southall when it was offered for sale in 2009, and have now reached the final stages of a major investment project.
In the present paper, results of alkali reactivity tests for selected silica aggregates, both rapid and slow alkali reactive, with the use of ASTM procedures, have been presented.