HCL + NaOH = NaCl + H2O
Benzocaine is formed
HNO3 or N2O5·H2O
This broad use of the term is likely to have come about because alkalis were the first bases known to obey the Arrhenius definition of a base and are still among the more common bases.
Since Brønsted-Lowry acid-base theory, the term alkali in chemistry is normally restricted to those salts containing alkali and alkaline earth metal elements.
A base is most commonly thought of as an aqueous substance that can accept H+ ions.
A soluble base is also often referred to as an alkali if hydroxide ions (OH−) are involved.
This refers to the Brønsted-Lowry theory of acids and bases.
Alternative definitions of bases include electron pair donors (Lewis), and as sources of hydroxide anions (Arrhenius).
Examples of simple bases are sodium hydroxide (NaOH, which is thus an alkali and base) and ammonia (NH3 which is not 'alkali' but base).