The
Brønsted acidBH+
formed on protonation of a base
B
is called the conjugate acid of
B, and
B is the conjugate base of
BH+. (The conjugate acid always carries one unit of positive charge more than the base,
but the absolute charges of the species are immaterial to the definition.) For example:
the
Brønsted acidHCl
and its conjugate base
Cl−
constitute a conjugate acid–base pair.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1099
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
