Equivalence point

[josephcollins]

Hi ppl, I was wondering. I have found the Equivalence point from the graph of volume versus pH for a given titration. To determine the Half equivalence point for to calculate Pka=Ph, do I half the pH or the volume which I found for the Equivalence point initially? Thanks for any help, Joe

[chem_tr]

Dear friend,

Half equivalence in titrations means that the half mole of total acid or base is neutralized; it is not the half of pH value. Volume may be incorrect, so I recommend that you stick to mole ratios.