Determine the PH of a Solution Prepared by Mixing the Following

Multiple Choice

Determine the pH of a solution prepared by mixing the following:
25) 0 mL of 0.200 M HCl
75) 0 mL of 0.100 M NaOH
50) 0 mL of 0.200 M NaH₂PO₄
For H₃PO₄ K_a1 = 7.5 × 10^-3, K_a2 = 6.2 × 10^-8, and K_a3 = 4.8 × 10^-13.

A) 6.73
B) 5.18
C) 1.65
D) 4.32
E) 4.25