-I need to find the equivalence point, and the pKa values of the titrated acid.

Question

-I need to find the equivalence point, and the pKa values of the titrated acid.
-I need to calculate the average of my triplicates and their average deviation for each pKa.
-How do these values compare to the published values of the acid indicated (phosphoric acid).
-Calculate the % error.
I am supposed to find this information using 3 graphs. We titrated our carbonated beverage (Coke) with 0.01M NaOH
Trial 1

Trial 2

Trial 3

2 731 2.7 2.7 2.81 286 28 2.81 284 pH vs. Volume (mL) 10 25 3.5 3 251 3.29i 3.44i 3.54 3.55! 359 45 5 5.5 6.5 7.5 3.7) 3.8 3 91 4.04i 4.141 4.27i 4.431 8.5 10 9.5 10 10.5 20 30 40 Volume (ml) Trial 1Tnal 2- Tial 3

Explanation / Answer

The equivalence point is when the pH of your solution reaches 7.

To determine the pKa value I need the volume of Base required to reach the pH 7

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