Johannes Nicolaus Brønsted
Johannes Nicolaus Brønsted was a Danish physical chemist, who developed the Brønsted–Lowry acid–base theory simultaneously with and independently of Martin Lowry.
Portrait of Johannes Brønsted
Brønsted–Lowry acid–base theory
The Brønsted–Lowry theory (also called proton theory of acids and bases) is an acid–base reaction theory which was first developed by Johannes Nicolaus Brønsted and Thomas Martin Lowry independently in 1923. The basic concept of this theory is that when an acid and a base react with each other, the acid forms its conjugate base, and the base forms its conjugate acid by exchange of a proton (the hydrogen cation, or H+). This theory generalises the Arrhenius theory.
Image: Johannes Brønsted
Image: Thomas Martin Lowry 2