Chapter 20 - Acids, bases, and pH Flashcards
1
Q
Equations containing Ka and pKa
A
pKa = -log(Ka)
Ka = 10^-pKa
Ka = [H+][A-]/[HA]
2
Q
What is Kw and state its equation
A
Ionic product of water
Kw = [H+][OH-]
3
Q
Approximations for weak acids:
A
- [HA] =/= [H+]
- [H+] = [A-]
4
Q
When can you use Kw?
A
At 25°C
