Alkali: Perbedaan antara revisi
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Istilah "basa" dan "alkali" sering digunakan bergantian, terutama di luar konteks [[kimia]] dan teknik kimia.
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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
The second subset of bases is also called an "Arrhenius base".
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Soils with pH values higher than 7.3 are usually defined as being alkaline. These soils can occur naturally, due to the presence of alkali salts. Although some plants do prefer slightly basic soil (including vegetables like [[cabbage]] and fodder like [[buffalograss]]), most plants prefer a mildly acidic soil (with pHs between 6.0 and 6.8), and [[alkaline soil]]s can cause problems.<ref>{{cite book|title=[[Chambers's encyclopaedia]]: a dictionary of universal knowledge, Volume 1|publisher=J.B. Lippincott & Co|year=1888|page=148}}</ref>
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== Danau alkali ==
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