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Base
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: A [[base]] can be [[Harmful]], [[Irritant]] or [[corrosive]].
: [[Base]]s can [[Neutralisation|neutralise]] an [[acid]].
: Many [[base]]s are [[insoluble]] [[solid]]s.
: A [[base]] can be a:
*[[Metal Oxide]]
*[[Metal Carbonate]]
*[[Metal Hydroxide]]
: [[Metal Hydroxide]]s are [[soluble]] [[base]]s known as '[[Alkali]]s'.