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==Key Stage 3=====Meaning===A [[chemicalbase]] is a [[metal compound]] with a [[pH]] greater than [[neutral|7]]. ===About Bases===: A [[base]] can be [[Harmful]], [[Irritant]] or [[corrosive]].: [[Base]]s can [[Neutralisation|neutralise]] an [[acid]].: A [[base]] can be a:*[[Metal Oxide]]*[[Metal Hydroxide]]*[[Metal Carbonate]]: Many [[base]]s are [[insoluble]] [[solid]]s.: [[Metal Hydroxide]]s are [[soluble]] [[base]]s known as '[[Alkali]]s'.