For the equilibrium below, pKa₁ = 7.9 and pKa2 = 10.1. At what pH is [HA] equal to [A²-]?
For the equilibrium below, pKa₁ = 7.9 and pKa2 = 10.1. At what pH is [HA] equal to [A²-]?
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Question
![For the equilibrium below, pKa₁ = 7.9 and pKa2 = 10.1. At what pH is [HA] equal to
[A²-]?
H₂A <=> H+ + HA <=> 2H+ + A²-
OpH = 7.9
pH < 7.9
OpH > 10.1
pH = 10.1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F691d833d-667d-47e7-89c1-c8c6926199ae%2F2a220091-ae8c-44ab-a9df-f7e1930a513b%2F7fxc1rb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:For the equilibrium below, pKa₁ = 7.9 and pKa2 = 10.1. At what pH is [HA] equal to
[A²-]?
H₂A <=> H+ + HA <=> 2H+ + A²-
OpH = 7.9
pH < 7.9
OpH > 10.1
pH = 10.1
Expert Solution
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Step 1: PH and PKa.
pH of any acid or base tells us its hydrogen ion concentration.
PKa- it is that pH when the 50% dissociation of acid or base has occured. So when an acid or base dissociates into its constituents then it is defined in terms of pKa.-
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