Acids and Bases A2 Flashcards
1
Q
What is an acid
A
A proton donor
2
Q
What is a base
A
A proton acceptor
3
Q
Why is a logarithmic scale used for pH
A
The concentration of hydrogen ions in aqueous solution covers a very wide range
4
Q
How dissociated is water
A
Water is slightly dissociated into H+ and OH-
5
Q
What is Kw
A
The ionic product, Kw = [H+][OH-]
6
Q
What is Kw in pure water at 298k
A
Kw = [H+][OH-] = [H+]^2 = [OH-]^2. This is because in the equilibrium reaction, one mole of water dissociates into one mole of H+ and OH-. Kw = 10^-14
7
Q
How to calculate the pH of a strong acid
A
-log([H+])
8
Q
How to calculate the pH of a strong base
A
-log(10^-14/[OH-])
