The amino acid histidine has ionizable groups with pKa values of 1.8, 6.0, and 9.2, as shown. COO™ COO™ H₂N-CH H₂N-CH CH H CH N bbbb 6.0 CH H N COOH H₂N-CH CH₂ H -N CH lonizable -COOH group 1.8 COO -HisH+ -His CH -NH COO™ H₂N-CH 9.2 CH, H H N -NH₂ CH A biochemist makes up 80 mL of a 0.11 M solution of histidine at a pH of 5.1. She then adds 60 mL of 0.10 M HCl. What is the pH of the resulting solution?

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The amino acid histidine has ionizable groups with pKą values of 1.8, 6.0, and 9.2, as shown.
H₂N-CH
T
COOH
pH
CH₂ H
lonizable -COOH
group
=
CH
COO-
H₂N-CH
1.8
pk₁
CH2
-COO-
H
-N
CH
-HisH+
COO-
+
H₂N-CH
6.0
pk₂
CH2
-His
CH
-NH
COO-
H₂N-CH
9.2
pk3
CH2
-N
-NH₂
A biochemist makes up 80 mL of a 0.11 M solution of histidine at a pH of 5.1. She then adds 60 mL of 0.10 M HCl. What is
the pH of the resulting solution?
CH
Transcribed Image Text:The amino acid histidine has ionizable groups with pKą values of 1.8, 6.0, and 9.2, as shown. H₂N-CH T COOH pH CH₂ H lonizable -COOH group = CH COO- H₂N-CH 1.8 pk₁ CH2 -COO- H -N CH -HisH+ COO- + H₂N-CH 6.0 pk₂ CH2 -His CH -NH COO- H₂N-CH 9.2 pk3 CH2 -N -NH₂ A biochemist makes up 80 mL of a 0.11 M solution of histidine at a pH of 5.1. She then adds 60 mL of 0.10 M HCl. What is the pH of the resulting solution? CH
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