Equivalence Point Calculation: Joe's Question

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To determine the half equivalence point in a titration, it is essential to focus on the mole ratios rather than simply halving the pH or the volume at the equivalence point. The half equivalence point represents the stage where half of the total acid or base has been neutralized, which is crucial for calculating pKa using the formula pKa = pH. Therefore, the correct approach involves using the mole quantities rather than dividing the previously found pH or volume values.
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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
 
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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.
 

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