A Buffer Solution Is Made Such That the Initial Concentrations

Multiple Choice

A buffer solution is made such that the initial concentrations of lactic acid (HC₃H₅O₃) and the lactate ion (C₃H₅O₃-) are both 0.600 M.What is the resulting pH if 10.0 mL of 1.00 M hydrochloric acid is added to 0.500 L of the buffer solution? (The K_a of HC₃H₅O₃ is 1.4 *10^-4.)

A) 3.82
B) 3.88
C) 2.92
D) 4.79
E) 3.85