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: [[Alkali]]s can be used to [[Neutralisation|neutralise]] [[acid]]s.
: [[Alkali]]s can be [[concentrated]] or [[dilute]].
: [[Alkali]]s can be [[Weak Alkali|weak]] or [[Strong Alkali|strong]] which depends on the type of [[alkali]] and the [[concentration]].
: [[Alkali]]s turn [[Litmus]] paper blue.
: [[Alkali]]s turn [[Universal Indicator]] blue, indigo and purple depending on the strength of the [[alkali]].