What Is the Equilibrium PH of an Initially 4 $2.3 \times 10 ^ { - 11 }$

Multiple Choice

What is the equilibrium pH of an initially 4.9 M solution of hypoiodous acid, HOI, at 25°C (K_a = $2.3 \times 10 ^ { - 11 }$ ; K_w = 1.01 × 10^-14) ?

A) 4.97
B) 7.00
C) 5.12
D) 4.82
E) 8.34