Theories of acids and bases

Understanding

Application and skills

● A Brønsted–Lowry acid is a proton/H+ donor and a Brønsted–Lowry base is a proton/H+ acceptor.
Guidance
Students should know the representation of a proton in aqueous solution as both H+(aq) and H3O+(aq).
● Amphiprotic species can act as both Brønsted–Lowry acids and bases.
● A pair of species differing by a single proton is called a conjugate acid–base pair.

● Deduction of the Brønsted–Lowry acid and base in a chemical reaction.
Guidance
The location of the proton transferred should be clearly indicated. For example, CH3COOH/CH3COO–
rather than C2H4O2/C2H3O2
–.
● Deduction of the conjugate acid or conjugate base in a chemical reaction.
Guidance
Lewis theory is not required here.

Inquiry question

8.1 Why can amphiprotic species can act as both Brønsted–Lowry acids and bases?

8.1 How can I deduce the Brønsted–Lowry acid and base, as well as conjugate acid base pairs in chemical reactions?

Discussion of the history of theories about acids and bases

Task:
1. Enter the parlay discussion
2. Read about the theories of acids and bases throughout history
3. Participate in the discussion by answering the discussion questions and giving peer feedback