What is the pH at halfway to the equivalence point?

[sangdeep]

If 25.00 mL of 0.20 mol/L HCO2H(aq) is titrated with 0.26 mol/L NaOH(aq) determine the pH at halfway to the equivalence point. So far I have:

Moles of HCO2H = 0.005 mol; at half way = 0.0025 I don't know the next step.

 

[Borek]

Henderson-Hasselbalch equation

 

[epenguin]

Don't let the superfluous information in the question confuse you.