Calculate the pH of a solution that is 0.322 M in nitrous acid (HNO₂) and 0.178 M in potassium nitrite (KNO₂). The acid dissociation constant (Ka) of nitrous acid is 4.50 x 10⁻⁴
A. 14.26
B. 3.607
C. 3.093
D. 10.91
E. 4.589