A chemical compound that has six acidic hydrogen atoms available for reaction, such as orthophosphoric acid.
From 'hexa-' (six) plus 'acid' from Latin 'acidus' meaning sour. This chemistry term was coined to describe molecules with multiple available hydrogen ions.
A hexacid is basically an acid on steroids—it can donate six separate hydrogen ions, making it exponentially more reactive than simple acids like vinegar.
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