Changes

: 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]].