Consider the following facts for ionic product of water :
I. pKw = 14 (independent of temperature)
II. pKw = pKa + pKb
III. pKw = pH + pOH
IV. pH = \(\frac{1}{2}\) (pKw + pKa - pKb) for salts of weak acid and weak base.
Choose the correct option:
1
I and III are correct.
2
I and II are correct.
3
II and III are correct.
4
II, III and IV are correct.