الفهرس 
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Abstract
transfer equilibria was proposed by J.N* Br^nsted in (1923).
According to this theory, an acid is a epecieo which can lose a proton and a base is the species which accepts a proton.
It follows that the ionization of a neutral acid molecule
{£&) nay be written as:
H A ^__J» A” + H+ ...................... (1
Jtar the forward reaction, HA is behaving as an acid and for the Kteckward reaction A~” is behaving as a base. It is a general fapesult that the ionization of an acid always leads to a base
:»,
lich differs from the parent acid by one proton (H+). Both |fflf this acid and its base nay be referred to as a conjugate -base pair. This concept of acidity is equally applica-to positively charged, negatively charged, and neutral
An acid in solution only ionizes to an appreciable ex-according to equation (1) if there is a basic medium sent to accept the proton which is being lost. It is
late that many connon solvents (anphiprotic) are theri-Lves capable of acting as a proton donor or a proton acceptor.