2. In which of the following weak acid solutions would you expect the dissociation of the acid and water to both affect the pH of the solution?

i) 1.0x10-4 M methanoic acid (Ka = 1.8x10-4)
ii) 1.0x10-8 M methanoic acid
iii) 1.0x10-4 M phenol (Ka = 1.3x10-10)
iv) 1.0x10-8 M phenol

a) ii) only
b) iii) only
c) ii) and iii) only
d) ii), iii) and iv) only
e) all of them