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Acid
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: 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]].
: The [[acidity]] of an [[acid]] is measured on the [[pH]] scale. The more [[Hydrogen Ion|Hydrogen ions]] in a [[solution]] the lower the [[pH]].There are several common [[Chemical Reaction|reactions]] of [[acid]]s you should know:*[[Acid + Metal → Metal Salt + Hydrogen]]*[[Acid + Metal Oxide → Metal Salt + Water]]*[[Acid + Metal Hydroxide → Metal Salt + Water]]*[[Acid + Metal Carbonate → Metal Salt + Carbon Dioxide + Water]]
====Higher====
:The [[concentration]] of an [[acid]] is determined by how many [[gram]]s of [[acid]] are [[dissolve]] per [[litre]] ([[decimetre cubed]]) of [[water]]. A [[dilute]] [[acid]] has very little [[compound]] [[dissolve]]d per [[litre]] while a [[concentration|concentrated]] [[acid]] has a large [[mass]] of [[compound]] [[dissolve]]d per [[litre]].: When a [[compound]] does [[dissolve]] in [[water]] to produce an [[acid]] not all of the [[Hydrogen Ion|Hydrogen ion]]s will dissociate from the [[compound]]. The strength of an [[acid]], or its [[acidity]], is determined by how easily [[Hydrogen Ion|Hydrogen ions]] are formed. The more easily [[Hydrogen Ion|Hydrogen ions]] form, the stronger the [[acid]] (the higher the [[acidity]].