Question

a)benzoic acid (pka=4.2) and b)phenol (pka=10) is a stronger acid. a)citric acid (pka=3.08) and b)phosphoric acid (pka=2.10) is a stronger acid.

Answer 1

Phosphoric Acid

Step-by-step explanation:

Phosphoric Acid is the strongest acid. The lower the pKa the stronger the acid.

You can justify this by calculating Ka, which Ka = 10^-pKa

The higher the Ka value, the greater the dissociation of the acid, the more hydrogen protons will be formed and the lower the pH making it a stronger acid.