Bronsted and Lowry introduced the concept of acids and bases in 1923. According to Bronsted-Lowry theory, an acid is a proton donor and can donate a hydrogen ion to another molecule, while a base is a proton acceptor and can accept a hydrogen ion from another molecule. The conjugate acid of a base is the molecule formed when the base accepts a proton, while the conjugate base of an acid is the molecule formed when the acid donates a proton. Water is provided as an example of an amphoteric substance that can act as both an acid and a base by donating or accepting protons.

1. CHEMISTRY 10
CHAPTER # 10
BRONSTED LOWRY CONCEPT

2. BRONSTED and LOWRY
gave us acids bases concept in
1923

4. What are acids?

5. Brønsted-Lowry acid
A Brønsted-Lowry acid is any species
that can donate a proton (H +) to
another molecule.

6. What are bases?

7. Brønsted-Lowry base
A Brønsted-Lowry base is any species
that can accept a proton (H +) from
another molecule.

9. CONJUGATE ACID
The conjugate acid of a Brønsted-
Lowry base is the species formed
after a base accepts a proton.
BL-BASE CONGUGATE ACID
𝑯 𝟐 𝟎 + 𝑯𝑪𝒍 → 𝑪𝒍−
+ 𝑯 𝟑 𝑶

10. CONJUGATE BASE
The conjugate base of a Brønsted-
Lowry acid is the species formed
after an acid donates a proton.
BL-ACID CONJUGATE BASE
𝑯𝑪𝒍 + 𝑯 𝟐 𝟎 → 𝑪𝒍−
+ 𝑯 𝟑 𝑶

12. AMPHOTERIC SUBSTANCE
Amphoteric, is such substance which can
act as both a Brønsted-Lowry acid and
a Brønsted-Lowry base.

13. Here water is acting as a base

14. Here water is acting as an acid