A buffer solution is made that is
0.331 M in H₂CO₃ and 0.331M in
KHCO₃. If K_(nl) for H₂CO₃ is 4.20x10⁻⁷, what is the pH of the buffer solution?
pH= ___

Write the net ionic equation for the reaction that occurs when 0.073 mol HCl is added to 1.00 L of the buffer solution.
(Use the lowest possible coefficients. Omit states of matter. Use H₃O⁺ instead of H⁺)