Answer Happy

I NEED HELP ASAP! PLEASE READ QUESTION FIRST!!!
Please, DO NOT TRY TO COPY ANOTHER QUESTION SOLUTION AND
PASTE IT HERE, this is another question.
Need help with Half-equivalence volume, pKa, % dev . Please show
correct and full solution and I'll give thumbs up.Volume from plot
3 is in 2nd pic.
Trial 1: 14ml, 9.88 pH
Trial 2: 13.90mL. 8.05 pH
Trial 3: 14.00mL, 9.47pH
Determination of Acid Dissociation Constant
(Ka) of KHP
Answer the exact half-equivalence volumes in 3
decimal places.
Answer the pKa in 2 decimal places.
Answer the Volume from data, %deviation and RSD
in 3 significant
figures.
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Standardization of NaOH Solution
Primary Standard: KHP
Formula mass of 1º standard: 204.22 g/mol
% Purity of 1º standard: 95.0%
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Determination of Percent Purity of KHP Sample
Theoretical %purity is 60.0%. (Just some added
information)