A chemical compound that contains two acidic hydrogen atoms that can be replaced by a base, making it able to donate two protons.
From Greek 'dia-' (two) + Latin 'acidus' (sour). The prefix 'di-' combined with 'acid' was standardized in chemistry during the 19th century to describe molecules with two replaceable hydrogen atoms.
Diacids are like molecules with two punch cards—they can each hand off a hydrogen proton to something else twice, which is why sulfuric acid (H₂SO₄) is such a powerful industrial chemical; it gets to donate twice!
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