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Assalam o Alaikum students :in this lecture i discussed the problem of Bronsted-Lowry Concept of acid acid base .
In 1923, the Danish chemist Bronsted and the English chemist Lowry independently presented their theories of acids and bases on the basis of proton-transfer. According to this concept:
An acid is a substance (molecule or ion) that can donate a proton (H+) to another substance.
A base is a substance that can accept a proton (H+)from another substance.
in these problem of lowry bronsted concept of acid and base we can explain the conjugate acid and conjugate base pairs .
For example, HCl acts as an acid while NH3 acts as a base:
A conjugate acid is a specie formed by accepting a proton by a base.
A conjugate base is a specie formed by donating a proton by an acid.
According to Bronsted-Lowry concept, an acid and a base always work together to transfer a proton. That means, a substance can act as an acid (proton donor) only when another substance simultaneously behaves as a base (proton acceptor). Hence, a substance can act as an acid as well as a base, depending upon the nature of the other substance. For example, H2O acts as a base when it reacts with HCl as stated above and as an acid when it reacts with ammonia.
Such a substance that can behave as an acid, as well as, a base is called amphoteric.
It has been observed that there are certain substances which behave as acids though they do not have the ability to donate a proton, e.g.,SO3 . Similarly, CaO behaves as a base but it cannot accept a proton. These observations prove the limitations of Bronsted-Lowry concept of acids and bases.
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lowry bronsted concept of acid and base or lowry bronsted theory of acid and base is discussed above .
punjab text book board/Sindh text book board/KPK text book board 10th Class book lecture 4 is delivered in Urdu/hindi/English. This lecture for 10th class Chemistry chapter 10 for all students who want to prepare this topic in detail and gain 100% marks.
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