Equlibria A Level Flashcards
1
Q
Bronsted-lowry acid
A
proton donor
2
Q
Bronsted-lowry base
A
proton acceptor
3
Q
Monoprotic acid
A
donates 1 mole of protons per mole of acid
4
Q
Diprotic acid
A
Donated 2 moles of proton per mole of acid
5
Q
Degree of dissociation
A
fraction or percentage of molecules that dissociate into ions.
6
Q
Kw
A
Kw=[H+] [OH-]
7
Q
Ka
A
Ka= [H+][A-] / [HA]
8
Q
pH of buffer solution
A
pH= pKa +log[salt]/[acid]
9
Q
pH
A
pH=-log[H+]
10
Q
pH of weak acids
A
pH=root(Ka × [HA])
11
Q
What are Buffer solutions
A
Solutions that resist changes in pH when small amounts of acid or base is added
12
Q
Why does Kw vary with temperature
A
- forward reaction of the dissociation of water is endothermic.
- increase in temperature favours the endothermic reaction.
- [H+] and [OH-] increase
- hence Kw increases
13
Q
Neutral salt
A
strong acid + strong base
14
Q
Acidic salt
A
strong acid + weak base
15
Q
Basic salt
A
strong base + weak acid
