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Acid
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: When an [[acid]] is [[dissolve]]d in [[solution]] the [[Hydrogen]] [[atom]]s in the [[molecule]] become free to move around and these are what make it an [[acid]].
: [[Acid]]s can be [[concentrated]] or [[dilute]].
: [[Acid]]s can be [[Weak Acid|weak]] or [[Strong Acid|strong]] which depends on the type of [[acid]] and the [[concentration]].
: [[Acid]]s turn [[Litmus]] paper red.
: [[Acid]]s turn [[Universal Indicator]] pink, red, orange or yellow depending on the strength of the [[acid]].