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Meaning of ALKALI

Pronunciation:  'alku`lI

WordNet Dictionary
  1. [n]  any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water; "bases include oxides and hydroxides of metals and ammonia"
  2. [n]  a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture

ALKALI is a 6 letter word that starts with A.


 Synonyms: base
 See Also: chemical compound, compound, cyanuramide, glyoxaline, imidazole, iminazole, melamine, purine, pyridine, pyrimidine, salt



Webster's 1913 Dictionary
  1. \Al"ka*li\ (?; 277), n.; pl. {Alkalis} or {Alkalies}. [F.
    alcali, ultimately fr. Ar. alqal[=i] ashes of the plant
    saltwort, fr. qalay to roast in a pan, fry.]
    1. Soda ash; caustic soda, caustic potash, etc.
    2. (Chem.) One of a class of caustic bases, such as soda,
       potash, ammonia, and lithia, whose distinguishing
       peculiarities are solubility in alcohol and water, uniting
       with oils and fats to form soap, neutralizing and forming
       salts with acids, turning to brown several vegetable
       yellows, and changing reddened litmus to blue.
    {Fixed alkalies}, potash and soda.
    {Vegetable alkalies}. Same as {Alkaloids}.
    {Volatile alkali}, ammonia, so called in distinction from the
       fixed alkalies.
  2. \Al"ka*li\, n.
    Soluble mineral matter, other than common salt, contained in
    soils of natural waters. [Western U. S.]
Biology Dictionary
 Definition: A fundamental category of many compounds whose water-based solutions have a bitter taste, a slippery feel in water, turn red litmus paper blue, and can react with acids to form salts. A base has a pH higher than 7; a strong base will have a pH of 13 or higher. Specific types of bases include:
  1. Arrhenius base: any chemical that increases the number of free hydroxide ions (OH-) when they're added to a water-based solution. The more ions produced, the stronger the acid.
  2. Bronsted or Bronsted-Lowry base: any chemical that acts as a proton acceptor in a chemical reaction.
  3. Lewis base: any chemical that donates two electrons to form a covalent bond during a chemical reaction.
Thesaurus Terms
 Related Terms: acid, acidity, agent, alkalinity, alloisomer, anion, antacid, atom, biochemical, cation, chemical, chemical element, chromoisomer, compound, copolymer, dimer, element, heavy chemicals, high polymer, homopolymer, hydracid, inorganic chemical, ion, isomer, macromolecule, metamer, molecule, monomer, neutralizer, nonacid, organic chemical, oxyacid, polymer, pseudoisomer, radical, reagent, sulfacid, trimer