If 0.1 moles of Na2HPO4 and 0.1 moles of NaH2PO4 are mixed in water, what is the resulting pH? The pKa values for phosphoric acid are 2.1, 7.2, 12.4.
A) 2.1
B) 4.65
C) 7.2
D) 9.8
E) 12.4
Correct Answer:
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