C21 Buffers And Neutralisation Flashcards
1
Q
What does the pH of a buffer depend on?
A
pKa of weak acid
Ratio of conc of weak acid and its conjugate base
2
Q
Define buffer solution
A
Mixture of weak acid and its conjugate base which minimises changes in pH when small quantities of acid or alkali are added.
3
Q
What does a buffer contain?
A
Weak acid and conjugate base
4
Q
Define conjugate acid-base pair
A
Contains 2 species that can be interconverted by the transfer of a proton
5
Q
When is a buffer most effective?
A
[HA] = [A-]
pH of buffer solution = pKa of HA
6
Q
How can a buffer be prepared?
A
Mixing weka acid with solution of its salt
Partially neutralising solution of weak acid