Lactic Acid, Which Is Found in Milk Products, Has a PK_a

Multiple Choice

Lactic acid, which is found in milk products, has a pK_a of 3.85. A 50.0 mL solution of 0.05 M lactic acid is titrated with 0.025 M sodium hydroxide. What is the pH of the solution after 64.0 mL of the sodium hydroxide has been added?

A) 3.85
B) 3.60
C) 9.90
D) 4.10
E) 7.00