How much NaH2PO4 • 2H2O must be added to 400.0 mL of 0.200 M H3PO4 to create a buffer solution with pH = 2.30? For H3PO4, pKa1 = 2.12, pKa2 = 7.21, and pKa3 = 1 | Acid-Base Chemistry | TheChemSolver

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Question

How much NaH₂PO₄ • 2H₂O must be added to 400.0 mL of 0.200 M H₃PO₄ to create a buffer solution with pH = 2.30? For H₃PO₄, pKa₁ = 2.12, pKa₂ = 7.21, and pKa₃ = 12.38.

A.

0.0144 mol

B.

0.0529 mol

C.

0.121 mol

✓ Correct

D.

0.303 mol

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