What Is the Equilibrium PH of an Initially 0 $7.8 \times 10 ^ { - 5 }$

Multiple Choice

What is the equilibrium pH of an initially 0.83 M solution of the monoprotic acid 3-chloropropanoic acid at 25°C (K_a = $7.8 \times 10 ^ { - 5 }$ ) ?

A) 2.10
B) 7.00
C) 1.79
D) 12.21
E) 5.21