posted by chamy on .
When 50.0 mL of 0.050 M formic acid, HCHO2, is
titrated with 0.050 M sodium hydroxide, what is the pH
at the equivalence point?
NaOH + HCOOH ==> HCOONa + H2O
The pH at the equivalence point is determined by the hydrolysis of the salt, in this case sodium formate.
Write the hydrolysis equation and set up an ICE chart, solve for OH^- and converft to pH. Kb for the formate ion is Kb = Kw/Ka for formic acid.