You made a pH 9.0 buffer solution at 25°C by mixing NaOH and histidine (HisH) to give a solution that is 0.200 M in total concentration of histidine. Deprotonation constants and enthalpies (heats) of deprotonation at 25°C Compound Deprotonation Histidine Water H₂O-OH + H+ Part A H₂NRH COOH- H₂NRH COO + H H₂NRH COO + H₂NRCOO+H+ H₂NRCOO-H₂NRCOO + H+ [His] 1.261 10-8 M Calculate the concentration of His (= [H₂NRCOO-]) at 25°C. Express your answer using two significant figures and include the appropriate units. Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining ▾ Part B PK A, H (kJ mol-¹) 1.80 6.04 9.33 14.00 ? 29.9 46.6 55.82 Calculate the concentration of HisH(= [H₂NRCOO-]) at 25°C. Express your answer using two significant figures and include the appropriate units.
You made a pH 9.0 buffer solution at 25°C by mixing NaOH and histidine (HisH) to give a solution that is 0.200 M in total concentration of histidine. Deprotonation constants and enthalpies (heats) of deprotonation at 25°C Compound Deprotonation Histidine Water H₂O-OH + H+ Part A H₂NRH COOH- H₂NRH COO + H H₂NRH COO + H₂NRCOO+H+ H₂NRCOO-H₂NRCOO + H+ [His] 1.261 10-8 M Calculate the concentration of His (= [H₂NRCOO-]) at 25°C. Express your answer using two significant figures and include the appropriate units. Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining ▾ Part B PK A, H (kJ mol-¹) 1.80 6.04 9.33 14.00 ? 29.9 46.6 55.82 Calculate the concentration of HisH(= [H₂NRCOO-]) at 25°C. Express your answer using two significant figures and include the appropriate units.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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F. Calculate the concentration of OH 25 degrees at 25 Express your answer using two significant figures and include the appropriate units.
G. Calculate the concentration of Na at 25 ∘ C Express your answer using two significant figures and include the appropriate units.
I. Calculate the concentration of His− at 45 ∘C .
J. Calculate the concentration of HisH at 45 ∘C
k. Calculate the concentration of HisH+2 at 45 ∘C .
L. Calculate the concentration of HisH2+3 at 45 ∘C
M. Calculate the concentration of H+ at 45 ∘C
n. Calculate the concentration of OH−at 45 ∘C
O. Calculate the concentration of Na+
at 45 ∘C
.
![5:02 Mon, Oct 2
⠀⠀⠀
You made a pH 9.0 buffer solution at 25° C by mixing NaOH and histidine (HisH) to give a solution that is 0.200 M in total concentration of histidine.
Deprotonation constants and enthalpies (heats) of deprotonation at 25°C
Compound Deprotonation
+H3NRH+COOH→ H3NRH+COO¯ + H+
Histidine +H3NRH+COO¯→ H3NRCOO¯ + H+
+H3NRCOO¯→H₂NRCOO¯ + H+
H₂O→OH¯ + H+
Water
Part A
Submit
Calculate the concentration of His¯ (= [H₂NRCOO¯]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
0
HÅ
[His] 1.261 107 M
Part B
+
Previous Answers Request Answer
X Incorrect; Try Again; 2 attempts remaining
HÅ
[HisH] = 0.200
Calculate the concentration of HisH(= [+H3NRCOO¯]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
M
pK A, H° (kJ mol−¹)
1.80
6.04
9.33
14.00
C
29.9
46.6
55.82
?
• P
hulu
|||
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Transcribed Image Text:5:02 Mon, Oct 2
⠀⠀⠀
You made a pH 9.0 buffer solution at 25° C by mixing NaOH and histidine (HisH) to give a solution that is 0.200 M in total concentration of histidine.
Deprotonation constants and enthalpies (heats) of deprotonation at 25°C
Compound Deprotonation
+H3NRH+COOH→ H3NRH+COO¯ + H+
Histidine +H3NRH+COO¯→ H3NRCOO¯ + H+
+H3NRCOO¯→H₂NRCOO¯ + H+
H₂O→OH¯ + H+
Water
Part A
Submit
Calculate the concentration of His¯ (= [H₂NRCOO¯]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
0
HÅ
[His] 1.261 107 M
Part B
+
Previous Answers Request Answer
X Incorrect; Try Again; 2 attempts remaining
HÅ
[HisH] = 0.200
Calculate the concentration of HisH(= [+H3NRCOO¯]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
M
pK A, H° (kJ mol−¹)
1.80
6.04
9.33
14.00
C
29.9
46.6
55.82
?
• P
hulu
|||
<
69%
![5:02 Mon, Oct 2
⠀⠀⠀
▼
Part C
Calculate the concentration of HisH₂ (= [+H3NRH+COO-]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
[HisH₂] =
Submit
Part D
Submit
Part E
Value
Request Answer
Calculate the concentration of HisH²+(= [+H3NRH+COOH]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
[H+] =
μA
0
[HisH²+] = Value
µÅ
Request Answer
µÅ
Value
Units
Units
Calculate the concentration of H+ at 25° C.
Express your answer using two significant figures and include the appropriate units.
Units
?
C
?
?
• P
hulu
|||
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68%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F33aa7296-1efe-4650-a4fc-6ae6d66fe8f7%2Ff4c69334-44a0-46a1-b78e-015599cb72fa%2Fc0c5p99_processed.jpeg&w=3840&q=75)
Transcribed Image Text:5:02 Mon, Oct 2
⠀⠀⠀
▼
Part C
Calculate the concentration of HisH₂ (= [+H3NRH+COO-]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
[HisH₂] =
Submit
Part D
Submit
Part E
Value
Request Answer
Calculate the concentration of HisH²+(= [+H3NRH+COOH]) at 25°C.
Express your answer using two significant figures and include the appropriate units.
[H+] =
μA
0
[HisH²+] = Value
µÅ
Request Answer
µÅ
Value
Units
Units
Calculate the concentration of H+ at 25° C.
Express your answer using two significant figures and include the appropriate units.
Units
?
C
?
?
• P
hulu
|||
<
68%
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