Acidic hydrogen is a hydrogen atom that has a tendency to forms a positive ion when the acid dissociates. Hydrogens that are directly linked to extremely electronegative atoms such as oxygen, sulphur, and halogens have high acidity.
The hydrogen atom on the carboxylate group in methanoic acid HCOOH⇌H++HCOO− is the acidic hydrogen (the one bound directly to the carbon atom does not dissociate).
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