alkali

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

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