What does bibasic mean?
Bibasic is a technical adjective used chiefly in chemistry to describe a substance that has two bases or can react with two equivalents of an acid. A bibasic compound, such as calcium hydroxide, can furnish two hydroxide ions per molecule, and a bibasic salt contains two atoms or groups that can be replaced by acidic radicals. The word is essentially synonymous with the more widely used 'dibasic', and it appears most often in older textbooks or in contexts where the older terminology has been retained. Outside scientific writing the word is rare, and general readers are unlikely to encounter it except when reading historical or specialized chemical literature. Its value lies in precise technical description rather than everyday communication, and anyone studying classical chemistry texts will find it helpful to recognize it as a variant of the standard modern term.
adjectiveHaving two bases; capable of reacting with two molecules of an acid or of yielding two hydroxide ions per molecule.
- Having two bases; in chemistry, capable of combining with two equivalents of an acid or yielding two hydroxide ions.
"The chemist noted that the compound was bibasic, requiring two equivalents of acid for neutralization."
"Calcium hydroxide behaves as a bibasic compound because each molecule can furnish two hydroxide ions."
"Older textbooks sometimes describe such salts as bibasic rather than using the modern term dibasic."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bibasic
Bibasic is formed from the prefix 'bi-', from Latin meaning 'two', combined with 'basic', derived from 'base', which ultimately traces through Late Latin 'basis' to Greek 'basis' meaning 'foundation'. The word arose in nineteenth-century chemical nomenclature alongside related terms like monobasic and tribasic, which classified acids and salts by the number of replaceable hydrogen atoms or hydroxide ions they contained. It shares its root with words such as 'basis' and 'debase'.
How bibasic is actually used
A technical term used mainly in older or specialized chemical literature; 'dibasic' is the standard modern form. Not used in everyday speech.
Easily confused with bibasic
'Dibasic' is the far more common synonym in modern chemistry; 'bibasic' is an older or less frequent variant meaning the same thing.