Find the concentration of an unknown acid from a titration lab, chemistry homework help

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I did an online titration with an unknown acid and NaOH as the titrant. Please look at the photos linked. The first is prior to the titration, and the second is of the completed curve.

pKa = 5.60, therefore the Ka = 2.51x10^-6

volume of unknown acid solution = 25mL

concentration of NaOH used in the titration = 0.5M

I believe that the pH prior to starting the titration was 2.87, as you can see from the bottom left table on the first image.

Please show me how to find the concentration of the unknown acid. Thank you.

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Titration Simulator Created by Yue-Ling Wong (ylwong@wfu.edu) 14 T H 3 2 no 9 pH 8 7 6 a 5 4 3 2 1 0 0 0 5 10 15 20 40 45 50 25 30 35 mL of NaOH added n Lab instructions Main Menu Titration Data: A NaOH added pH Re-run with the same unknown conc 0.000 mL 2.87 > vol. of acid solution = 25 mL Enter the conc. of NaOH used in this titration 0.5 Enter NaOH to add 1 mL Restart with a new unknown pka a The pka of the acid is determined to be: How to calculate this M Turn in lab report! Titration Simulator Created by Yue-Ling Wong (ylwong@wfu.edu) T 4 3 2 1 0 12 pH 9 8 7 6 a 5 4 3 2 1 0 5 10 15 20 35 40 45 50 Out of NaOH? 25 30 mL of NaOH added Lab instructions Main Menu Titration Data: Re-run with the same unknown conc >> vol. of acid solution = 25 mL Enter the conc. of NaOH used in this titration 0.5 M Restart with a new unknown pka a A 16.00 ML 17.00 ML 18.00 mL 19.00 ML 20.00 mL 21.00 mL 22.00 mL 23.00 mL 24.00 ML 25.00 ML 5.47 5.51 5.56 5.60 5.65 5.69 5.73 5.78 5.82 5.87 Enter NaOH to ada mL The pka of the Acid is determined to be: 5.60 How to calculate this M м. ♡ Good Job!
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