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 ?
SIC 281 is composed of four 4-digit industries -- SIC 2812, Alkalies and Chlorine, consisting of establishments manufacturing these two chemicals and such other related chemicals as soda ash and caustic soda; SIC 2813, Industrial Gases, with establishments manufacturing such gases as acetylene, carbon dioxide, oxygen, and others; SIC 2816, Inorganic Pigments, with establishments manufacturing pigments destined mostly for industrial paints, such as used for automobiles and household appliances; and SIC 2819, Industrial Inorganic Chemicals, not elsewhere classified, with establishments manufacturing a wide variety of bulk or commodity chemicals, such as acids, phosphates, potassiums, sulfurs, sodiums (salts), metallic compounds, and catalysts.
Tamer Hassan, a Dubai-based pharmacist, explains that alkalies are soluble salts that are effective in removing dirt without excessive rubbing.
THE JOINT venture project between Gujarat Alkalies and Chemicals Ltd and international chemical giant Dow Chemicals -- Dow- GACL Solventure Ltd -- is yet to get clearance from the Gujarat government's industrial safety and health department for the construction of the plant at Dahej.
The CAB comprises indicators relating to the production of chlorine and other alkalies, pigments, plastic resins and other selected basic industrial chemicals; chemical company stock data; hours worked in chemicals; publicly sourced, chemical price information; end-use (or customer) industry sales-to-inventories; and several broader leading economic measures (building permits and new orders).
Belgium), Kem One (France), Shin-Etsu (Japan), and Gujarat Alkalies & Chemicals Ltd.
Environmental activists have alleged that Dow is setting up a chloromethane unit in Dahej and Gujarat Alkalies and Chemicals Ltd ( GACL) without obtaining mandatory environmental clearances.
Basic chemicals include petrochemicals, industrial gases, dyes and pigments, alkalies and chlorine, alcohols, and various other organic (based on the chemistry of carbon and oxygen) and inorganic chemicals.
Tenders are invited for Industrial And Natural Safety Skin Paste Capable To Act As Cleanser, Conditioner And Protector, The Product Shall Not Contain Any Solvent/Detergent And Shall Be Able To Prevent Dermatitis Against Lube Oil, Hds Oil, Paints, Alkalies, Acids And Engine Coolant Water.
Brazil), Gujarat Alkalies and Chemical (India), Sasol Polymers (South Africa) (Public company), Unique Chemical (Malaysia), DSM Acrylonitrile B.
Carbon Tetrachloride Key Manufacturers Analysis includes The Dow Chemical Company, INEOS, AkzoNobel, Occidental Chemical Corporation, Gujarat Alkalies and Chemicals Limited, Shanghai Chlor-Alkali, Luzhou Xinfu.
industry comprises establishments primarily engaged in manufacturing basic inorganic chemicals (except industrial gases, inorganic dyes and pigments, alkalies and chlorine, and carbon black).
Tenders are invited for Steel Wire Reinforced Flexible Pvc Hose, Pvc Material As Per Is:6946:73, Steel Wire To Is: 4454 Part I:75, Hose Should Be Anticorrosive, Water And Dustproof, Acid, Alkalies And Fire Resistant Minimum Length Of Hose Should Be 30 Mtrs.