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5. The titration curve is gencrated for one of the following diprotic acids with standard 0.100 M sodium hydroxide. Only one of the pairs will show a single equivalence point. What acid is titrated and why is only one equivalence point obscrved? A) Resorcinol: pKi 9.30; pK2 11.06 B) Leucine pK,-2.33 ; pK,-9.74 C) pK 1.82 ; pK2 6.59 D) Salicylic acid pK 2.97;pK2 13.74 E) Tartaric acid pKi3.04pK2 436 Malcic acid

Explanation / Answer

This pH vs Volume of NaOH graph corresponds to the titration of Salicylic acid by NaOH.

The pK2 value of Salicylic Acid is too high to be titrated by NaOH.

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