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| style="height:20px; width:200px; text-align:center;" |Blood is around [[pH]] 7.4.
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==Key Stage 4==
===Meaning===
A [[base]] is a [[compound]] which is able to produce [[Hydroxide Ion|OH<sup>-</sup> ions]] when [[dissolve]]d in [[water]] to form a [[solution]] with a [[pH]] greater than [[Neutral (Chemistry)|7]].
===About Bases===
: [[Base]]s are [[Ionic Compound|ionic compounds]] where there is an [[Ionic Bond|ionic bond]] between a [[metal]] and an [[Oxide]], [[Carbonate]] or [[Hydroxide]].
: [[Base]]s will [[Chemical Reaction|react]] with [[acid]]s to form a [[salt]].
: Some [[base]]s are [[insoluble]].
: A [[soluble]] [[base]] will [[dissolve]]s in [[water]] to produce an [[alkali]] which has [[Hydroxide Ion|Hydroxide ions]] which are either donated by the [[base]] or formed by a [[Chemical Reaction|reaction]] with [[water]] to form a [[Hydroxide Ion|Hydroxide ion]].
: The [[Hydroxide Ion|Hydroxide ion]]s in an [[alkali]] will donate [[electron]]s to [[Hydrogen Ion|Hydrogen ions]] to form [[water]]. This is a [[neutralisation]] [[Chemical Reaction|reaction]].