If the pH at the equivalence point for titration of a monoprotic weak acid with NaOH...
If the pH at the equivalence point for titration of a monoprotic weak acid with NaOH is 9.00, and 10 mL of base is required to reach the equivalence point, how would you determine the pKa of the acid? the pKa is 9.00 determine the pH after 5 mL of base is added; this is the pKa determine the pH when 20 mL of base is added; this is the pKa the pKa is -log(9)
Homework Answers
Determine the pH after 5 mL of base is added; this is the pKa
Reason:
In Henderson Hasselbach equation:
pH = pKa + log ([conjugate base]/[acid )
For pH = pKa , the log term has to be zero, which happens when [conjugate base] = [acid]
This is the situation which occurs half way through the addition of base.
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