An ==Key Stage 3=====Meaning===[[acidHydrochloric Acid]] found in the is an [[stomachacid]] made of one [[hydrogen]] and one [[chlorine]] [[atom]]. ===About Hyrdrochloric Acid===: [[Hydrochloric Acid]] is found in the [[stomach]] of [[human]]s.: [[Hydrochloric Acid]] with a [[concentration]] between 2[[M]] and 6.5[[M]] is an [[irritant]].: [[Hydrochloric Acid]] with a [[concentration]] above 6.5[[M]] is [[corrosive]].