Answer:
pH = 9.30
Explanation:
We can obtain the pH of a buffer using H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the solution,
pKa the pKa of the buffer (9.24 for boric acid)
[A⁻] the molarity of the conjugate base, NaH2BO3
[HA] molarity of the weak acid, H3BO3
Replacing:
pH = 9.24 + log [0.36M] / [0.31M]
pH = 9.30
