A Solution Contains 10

Multiple Choice

A solution contains 10. mmol of H₃PO₄ and 5.0 mmol of NaH₂PO₄. How many milliliters of 0.10 M NaOH must be added to reach the second equivalence point of the titration of the H₃PO₄ with NaOH?

A) 2.0  10² mL
B) 150 mL
C) 250 mL
D) 1.0  10² mL
E) 50 mL