Question

What is the pH when 0.40 g of NaOH is added to 50,0 mL of 0.10 M HCOOH? No volume change. (Ka for HCOOH - 1.8 x 10^-4.)
Convert 0.40 g NaOH to moles.
Convert 50.0 mL x 0.1 M HCOOH to moles.
See which is in excess. If NaOH, then calculate pOH and pH.
If HCOOH, it will be a buffer and you should use the Henderson-Hasselbalch equation.

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