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alkali

alkali (ăl´kəlī) [Arab., al-gili=ashes of saltwort], hydroxide of an alkali metal. 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 metal.

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alkali

alkali †soda ash XIV; saltwort, Salsola kali XVI; any substance having the properties of soda XVII; (mod. chem.) hydroxide of sodium, potassium, etc. XIX. — medL. — Arab. al-ḳily calcined ashes, f. ḳalā fry, roast; see AL-2, KALI. Cf. F. alcali.
So alkaline XVII; cf. F. alcalin. alkaloid XIX. — G.

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alkali

al·ka·li / ˈalkəˌlī/ • n. (pl. -lis ) a chemical compound that neutralizes or effervesces with acids and turns litmus blue; typically, a caustic or corrosive substance of this kind such as lime or soda.Often contrasted with acid; compare with base1 .

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alkali

alkali Soluble base that reacts with an acid to form a salt and water. A solution of an alkali has a pH greater than 7. Alkali solutions are used as cleaning materials. Strong alkalis include the hydroxides of the alkali metals and ammonium hydroxide. The carbonates of these metals are weak alkalis.

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alkali

alkali (or base) A compound that takes up hydrogen ions and so raises the pH of a solution; see also acid; buffers; salt.

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alkali

alkali (al-kă-ly) n. a base that is soluble in water. Alkaline solutions turn litmus paper blue. See base.

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alkali

alkali A base that dissolves in water to give hydroxide ions (OH).

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alkali

alkalially, phalli •Adlai • gadfly • blackfly • damselfly •sandfly • barfly • mayfly •Eli, Ely •greenfly • bacilli • multiply • styli •whitefly • wall eye • horsefly •housefly •alveoli, E. coli, gladioli •blowfly • lapis lazuli • reguli • stimuli •flocculi • ranunculi • firefly •discoboli • astragali • dragonfly •alkali • Lorelei • Naphtali • butterfly •hoverfly

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