An Aqueous Solution Has [HC₇H₅O₂] = 0

Multiple Choice

An aqueous solution has [HC₇H₅O₂] = 0.100 M and [Ca(C₇H₅O₂) ₂] = 0.200 M.K_a = 6.3 × 10^-5 for HC₇H₅O₂.The solution volume is 5.00 L.What is the pH of this solution after 5.00 mL 10.0 M HCl(aq) is added?

A) 4.80
B) 4.86
C) 4.65
D) 4.70
E) 4.75