Assume that pKa(1) = 2.0 and that pKa(2) = 9.0. Suppose that the total concentration of the amino acid is 1.0 mM. Report to two significant digits.

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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Consider an amino acid (A) with no ionizable side chains, and call the three species involved in the acid/base equilibria H2A+, HA, and A- (see scheme below). Assume that pKa(1) = 2.0 and that pKa(2) = 9.0. Suppose that the total concentration of the amino acid is 1.0 mM. Report to two significant digits. 

pH

[H2A+] (mM)

[HA] (mM)

[A-] (mM)

1.0

     

2.0

     

3.0

     

4.0

     

5.0

     

6.0

     

7.0

     

8.0

     

9.0

     

10.0

     

11.0

     

12.0

     

 

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