This includes basic concept of Bronsted Lowary Acid And Base Concept

1. LECTURE# 02
CHEMISTRY
09 -06 -2020
Unit # 2
Acids, Bases and Salts

4. LOWERY BRONSTED CONCEPT
In1923 Bronsted and Lowery proposed another
theory to overcome the shortcomings of Arrhenius
theory. This theory is Known as Bronsted –Lowery
theory.

5. ACID
An acid is a Substance (a compound or an ion) that can
donate proton donates (H+) to another substance .
CH3COOH → H+ + CH3COO-

7. BASE
A base is substance that can accept
proton (H+) from another substance
NH3 + H+ → [ NH4]+

9. • All the acids included in Arrhenius theory
are also Lowary Bronsted acids
• And all the bases included in Arrhenius
theory except OH- are not bases

10. AMPHOTERIC SPECIES
Substance that acts both as proton
donor and a proton acceptor is said to
be amphoteric. e.g. water

12. Self Assessment 10.1
Identify Bronsted acids and bronsted bases in
following reactions.
1. H2SO4 + H2O → HSO4 - + H3O+
2. CH3COOH + H2O → CH3COO- + H3O+
3. H2S + NH3 → NH4+ +HS-