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 +H₂NRH+COOH+H₂NRH COO + H+ +H3NRH+COOH3NRCOO + H+ H₂NRCOO →H₂NRCOO +H H₂O OH+H' ▼ Part O [Na+] = Calculate the concentration of Na+ at 45 °C. Express your answer using two significant figures and include the appropriate units. Submit Request Answer Value Submit [H+] = Value Part N μA μA Calculate the concentration of H+ at 45 °C. Express your answer using two significant figures and include the appropriate units. Request Answer μÀ [OH-] = Value pK A, H° (kJ mol 1) 1.80 6.04 9.33 14.00 Units Submit Request Answer Units Calculate the concentration of OH at 45 °C. Express your answer using two significant figures and include the appropriate units. Units 29.9 46.6 55.82 ? ? ?
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 +H₂NRH+COOH+H₂NRH COO + H+ +H3NRH+COOH3NRCOO + H+ H₂NRCOO →H₂NRCOO +H H₂O OH+H' ▼ Part O [Na+] = Calculate the concentration of Na+ at 45 °C. Express your answer using two significant figures and include the appropriate units. Submit Request Answer Value Submit [H+] = Value Part N μA μA Calculate the concentration of H+ at 45 °C. Express your answer using two significant figures and include the appropriate units. Request Answer μÀ [OH-] = Value pK A, H° (kJ mol 1) 1.80 6.04 9.33 14.00 Units Submit Request Answer Units Calculate the concentration of OH at 45 °C. Express your answer using two significant figures and include the appropriate units. Units 29.9 46.6 55.82 ? ? ?
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter16: Principles Of Chemical Reactivity: The Chemistry Of Acids And Bases
Section: Chapter Questions
Problem 116IL: Amino acids are an important group of compounds. At low pH, both the carboxylic acid group (CO2H)...
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Question
![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
▼
+H3NRH+COOH+H₂NRH
COO + H+
+H3NRH+COOH3NRCOO¯ + H+
+H3NRCOO →H₂NRCOO + H
H₂O-OH + H¹
Part O
[Na] =
Calculate the concentration of Na+ at 45 °C.
Express your answer using two significant figures and include the appropriate units.
Submit
[H+] =
0
Ti μA
Value
Part N
Request Answer
μA
Calculate the concentration of H+ at 45 °C.
Express your answer using two significant figures and include the appropriate units.
Value
Submit Request Answer
μA
[OH-] = Value
Submit Request Answer
pK A, H° (kJ mol ¹)
1.80
6.04
9.33
14.00
Units
4
Units
Calculate the concentration of OH at 45 °C.
Express your answer using two significant figures and include the appropriate units.
Units
29.9
46.6
55.82
?
?
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Transcribed Image Text: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
▼
+H3NRH+COOH+H₂NRH
COO + H+
+H3NRH+COOH3NRCOO¯ + H+
+H3NRCOO →H₂NRCOO + H
H₂O-OH + H¹
Part O
[Na] =
Calculate the concentration of Na+ at 45 °C.
Express your answer using two significant figures and include the appropriate units.
Submit
[H+] =
0
Ti μA
Value
Part N
Request Answer
μA
Calculate the concentration of H+ at 45 °C.
Express your answer using two significant figures and include the appropriate units.
Value
Submit Request Answer
μA
[OH-] = Value
Submit Request Answer
pK A, H° (kJ mol ¹)
1.80
6.04
9.33
14.00
Units
4
Units
Calculate the concentration of OH at 45 °C.
Express your answer using two significant figures and include the appropriate units.
Units
29.9
46.6
55.82
?
?
?
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