Acids and Bases as Proton Transfer
IGCSE Edexcel Chemistry
2.35-2.36 Acids and bases as proton donors/acceptors
Key Concept:
An acid is a proton donor and a base is a proton acceptor.
Section A: Definitions
1. Define an acid and a base in terms of proton transfer.
[2]
2. In the reaction NH3 + HCl -> NH4Cl, identify the acid and base.
[2]
Section B: Applying the Model
3. In the reaction H2SO4 + H2O -> H3O+ + HSO4-, identify the acid and base.
[2]
4. Explain why water can act as a base in some reactions.
[2]
Total marks: 8
Mark Scheme
1.
Acid donates H+; base accepts H+ [2]
2.
HCl is acid, NH3 is base [2]
3.
H2SO4 is acid, H2O is base [2]
4.
Water can accept a proton to form H3O+ [2]