For serine (K_a1 = 6.5 × 10−³ and K_a2 = 6.2 × 10−¹⁰),at what pH does [Z] = [C⁺]?

Name: For serine (K a1 = 6.5 × 10− 3 and K a2 = 6.2 × 10− 10 ),at what pH does [Z] = [C + ]?
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Question

Quizplus · Accepted Answer

The pH at which the concentration of the zwitterion [Z] equals the concentration of the cation [C+] is the isoelectric point, which is calculated as the average of the two pKa values: (pKa1 + pKa2)/2 = (2.19 + 9.21)/2 = 5.70. However, the question asks for the pH where [Z] = [C+], which occurs at pKa1 = 2.19.

For Serine (Ka1 = 6

For Serine (K_a1 = 6