Equivalence Point Calculation: Joe's Question

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SUMMARY

The discussion centers on calculating the Half Equivalence Point in titrations to determine pKa from the pH value. Joe inquires whether to halve the pH or the volume at the Equivalence Point. The consensus is that the Half Equivalence Point refers to neutralizing half the moles of the acid or base, not halving the pH or volume values. Therefore, the correct approach is to focus on mole ratios rather than volume measurements.

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josephcollins
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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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