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Acid
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| style="height:20px; width:200px; text-align:center;" |Milk has a small amount of [[Lactic Acid]] giving it [[pH]] 6.5.
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==Key Stage 4==
===Meaning===
An [[acid]] is a [[compound]] which is able to donate [[Hydrogen Ion|H<sup>+</sup> ions]] when [[dissolve]]d in [[water]] to produce a [[solution]] with a [[pH]] less than [[Neutral (Chemistry)|7]].
===About Acids===
====Foundation====
: [[Acid]]s form from [[Ionic Compound|ionic compounds]] where there is an [[Ionic Bond|ionic bond]] between a [[Hydrogen]] [[ion]] and another part of the [[molecule]].
: When an [[acid]]ic [[compound]] [[dissolve]]s in [[water]] the [[Hydrogen Ion|Hydrogen ion]] becomes dissociated from the [[molecule]] and is free to move separately in the [[solution]].
: The [[Hydrogen Ion|Hyrdrogen ion]]s in an [[acid]] will accept [[electron]]s from any [[metal]] which is higher on the [[Reactivity Series|reactivity series]] than [[Hydrogen]]. This is because those [[metal]]s can lose their [[electron]]s more easily than the [[Hydrogen]] [[atom]].
====Higher====
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