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A buffer solution is made that is 0.444 M in H2CO3 and 0.444 M in NaHCO3. I Ka1 for H2CO3 is 4.20x10^-7, what is the pH of the buffer solution? Write the net ionic equation for the reaction that occurs when 0.091 mol KOH is added to 1.0 L of the buffer solution. (Use the lowest possible coefficients. Omit states of mater.)