What is the pH of a solution that is 0.49 M K2HPO4 and 0.056 M K3PO4?...

Question

Question

What is the pH of a solution that is 0.49 M K₂HPO₄ and 0.056 M K₃PO₄? Use the Acid-Base Table. Please see Buffer pH for assistance.

science chemistry

Answer 1

Answer #1

From Henderson- Hasselbalch equation

pH = pK_a + log [PO₄^3-]/[HPO₄^-]

From literature

pKa = 12.7

Also given that,

[PO₄^3-] = 0.056 M

and [HPO₄^-] = 0.49 M

pH = 12.7 + log (0.056/0.49) = 11.76

Answer 2

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