Describing an acid that can donate two hydrogen ions (protons) per molecule when it dissolves in water.
From di- (two) + protic (from proto- meaning first or primary, relating to protons, from Greek proton meaning first). A chemistry term for acids with two replaceable hydrogen atoms.
Sulfuric acid is a famous diprotic acid—it can release two hydrogen ions, which is why it's so powerful in reactions and why it's used in batteries and chemical manufacturing!
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