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Baris 19: There are various definitions for the concept of an alkali. Alkalis are sometimes defined as a subset of the bases. However, two subsets are commonly chosen. * A basic salt of an alkali metal or alkaline earth metal<ref>[http://dictionary.reference.com/search?q=alkali Alkali \| Define Alkali at Dictionary.com]. Dictionary.reference.com. Retrieved on 2012-04-18.</ref> (This includes Mg(OH)<sub>2</sub> but excludes NH<sub>3</sub>.) * Any base that is soluble in water and forms hydroxide ions<ref>[http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0029936.html alkali]. Tiscali.co.uk. Retrieved on 2012-04-18.</ref><ref>[http://www.thefreedictionary.com/alkali ~~alkali – definition~~alkali–definition of alkali by the Free Online Dictionary, Thesaurus and Encyclopedia]. Thefreedictionary.com. Retrieved on 2012-04-18.</ref><ref>[http://web.archive.org/web/20061124183909/http://www.wahyan.edu.hk/paulsir/handout/form4/4-05_Characteriscs_of_alkali.pdf Characteristics of Alkali]. (from L.H.M. Chung ''Integrated Chemistry Today'' pp. 363–365)</ref> or the solution of a base in water.<ref>[http://www.krysstal.com/acidbase.html Acids, Bases and Salts]. KryssTal. Retrieved on 2012-04-18.</ref> (This excludes Mg(OH)<sub>2</sub> but includes NH<sub>3</sub>.) The second subset of bases is also called an "Arrhenius base".

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