Hydrogen Sulfate Ion,HSO₄−,has an Acid Dissociation Constant of 1

Hydrogen sulfate ion,HSO₄−,has an acid dissociation constant of 1.0 × 10−².What is the pH of 0.45 M hydrogen sulfate?

A) 0.35
B) 1.21
C) 2.00
D) 2.19
E) 3.03