Proton transfer is the transfer of a hydrogen ion (H⁺) from one species to another, and it is the defining event of a Brønsted acid–base reaction. The acid donates the proton and the base accepts it. The two species formed are the conjugate base of the acid and the conjugate acid of the base.

质子转移是氢离子(H⁺)从一种物质转移到另一种物质的过程,它是布朗斯特酸碱反应的本质事件。酸给出质子,碱接受质子。所形成的两种物质是酸的共轭碱和碱的共轭酸。