A Solution Contains 25 Mmol of H₃PO₄ and 10

Multiple Choice

A solution contains 25 mmol of H₃PO₄ and 10. mmol of NaH₂PO₄. What volume of 2.0 M NaOH must be added to reach the second equivalence point of the titration of the H₃PO₄ with NaOH?

A) 60. mL
B) 30. mL
C) 5.0 mL
D) 12 mL
E) 25 mL