A diprotic acid (H2AH2A) has p?apKa values of 4.934.93 (p?a1pKa1) and 9.869.86 (p?a2pKa2). Which of the equalities is true when the pH is 4.934.93? [HA−]=[A2–][HA−]=[A2–] [H2A]=[A2–][H2A]=[A2–] [H2A]=[HA−][H2A]=[HA−] Which of the equalities is true when the pH is 9.869.86? [H2A]=[A2–][H2A]=[A2–] [HA−]=[A2–][HA−]=[A2–] [H2A]=[HA−][H2A]=[HA−] What is the predominant species of H2AH2A at pH 2.962.96? A2−A2− HA−HA− H2AH2A What is the predominant species of H2AH2A at pH 8.238.23? HA−HA− H2AH2A A2−A2− What is the

General, Organic, and Biological Chemistry
7th Edition
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Author:H. Stephen Stoker
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Chapter10: Acids, Bases, And Salts
Section: Chapter Questions
Problem 10.84EP: Indicate whether each of the following samples is acidic, basic, or neutral. a. butter, pH 6.1 b....
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A diprotic acid (H2AH2A) has p?apKa values of 4.934.93 (p?a1pKa1) and 9.869.86 (p?a2pKa2).
Which of the equalities is true when the pH is 4.934.93?
[HA−]=[A2–][HA−]=[A2–]
[H2A]=[A2–][H2A]=[A2–]
[H2A]=[HA−][H2A]=[HA−]
Which of the equalities is true when the pH is 9.869.86?
[H2A]=[A2–][H2A]=[A2–]
[HA−]=[A2–][HA−]=[A2–]
[H2A]=[HA−][H2A]=[HA−]
What is the predominant species of H2AH2A at pH 2.962.96?
A2−A2−
HA−HA−
H2AH2A
What is the predominant species of H2AH2A at pH 8.238.23?
HA−HA−
H2AH2A
A2−A2−
What is the predominant species of H2AH2A at pH 12.3312.33?
A2−A2−
HA−HA−
H2A
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