Turneric acid H 2 T, is a diprotic acid with pKa 1 = 4.28 and pKa 2 = 9.67. Whic

Question

Turneric acid H2T, is a diprotic acid with pKa1 = 4.28 and pKa2 = 9.67.

Which of these is the most abundant species at a pH of 3.78?

H2T

HT-    

T2-

Which of these is the least abundant species at a pH of 3.78?

H2T

HT-

   T2-

Which of these is the most abundant species at a pH of 4.78?

H2T

HT-

   T2-

Which of these is the least abundant species at a pH of 4.78?

H2T HT-    T2-

Which of these is the most abundant species at a pH of 9.17?

H2T

HT-

T2-

Which of these is the least abundant species at a pH of 9.17?

H2T

HT-

    T2-

Which of these is the most abundant species at a pH of 10.17?

H2T

HT-  

  T2-

Which of these is the least abundant species at a pH of 10.17?

H2T

HT-  

  T2-

Calculate the pH of a 0.077 M solution of H2T. Report pH to ± 0.01.


Calculate the pH of a 0.077 M solution of NaHT. Report pH to ± 0.01.


Calculate the pH of a 0.077 M solution of Na2T. Report pH to ± 0.01.

Explanation / Answer

A pH above pKa of a proton, that proton will be deprotonated.

Turneric acid H2T, is a diprotic acid with pKa1 = 4.28 and pKa2 = 9.67.

1. at pH 3.78 it exists as H2T

2. T2- will be the least abundant species

3. HT- will be the most abundant species at pH 4.78

4.  HT- will be the most abundant species at pH 9.17

5. H2T will be the least abundant species at pH 9.17

6. T2- will be the least abundant species at pH 10.17

7. H2T will be the least abundant species at pH 10.17

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