smartwork.wwnorton.com le Part 1| The Chemistry WWN9826: Chapter 16 homework Che

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smartwork.wwnorton.com le Part 1| The Chemistry WWN9826: Chapter 16 homework Chegg.com 26 of 30 (1 point) x Incorrect COA ST Tutorial Problem A 125.0 mg sample of an unknown titrated with a 0.050 M solution of NaOH. The pH of the solution was monitored throughout the titration, and the data were collected in the table below. Determine the Kg of the acid and use Appendix 5 to identify the unknown acid acid was dissolved in 100.0 mL of distilled water and Volume of OH pH Added (mL) Number 3.09 3.65 1410 Tools 10 15 17 18 19 20 21 4.10 4.50 4.55 4.71 4.94 5.11 5.37 5.93 x 10 Identity of acid 22.2 6.24 Check Answo View Solution O Hint Exit Activity ogress:

Explanation / Answer

at the equivalence point , the volume = 22.6

then the half-equivalence point = 11.3

at half-equivalence point pH = pKa

at 11.3 ml pH = 4.2    (by interpolation we get pH at 11.3 is 4.2)

so

pKa = 4.2

Ka = 6.3 x 10^-5

this value corresponds to benzoic acid

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