Consider the titration of TRIS, a weak base, as you carried out in lab. The conjugate acid of TRIS, TRISH has a pKa 8.06. Dut What is the pKb of TRIS? i4-9.06 What is the pH of a solution with 0.00300 moles of TRIS with dissolved in !50.00 mls of water? Calculate the pH upon addition of 15, 30 and 35 mls of 0.100 M HCl. 1:0 Here we will consider some reactions of a weak acid (HA) and a weak base (in this case, the conjugate of A). Recall that in water acids and bases undergo the following reactions: HA + H20 H30 A A H20 OH HA and dot 1) Write expressions for Ka and Kb. DHA 2) Write a balanced equation for the reaction of a weak acid (HA) with a strong base, OH-. (From, for example NAOH, which dissociates completely to OH in solution). Write an expression for Keq. Do you expect Keq to be small or large for this reaction? 3) Write a balanced equation for the reaction of a weak base (A) with a strong acid, H+, (From, for example, HCl which dissociates completely to H* in solution). Write a balanced equation for this reaction. Do you expect Keq to be small or large for this reaction? HO C 1Ue 4) How do your Keq for each reaction compare to your expressions for Ka and Kb? :
Consider the titration of TRIS, a weak base, as you carried out in lab. The conjugate acid of TRIS, TRISH has a pKa 8.06. Dut What is the pKb of TRIS? i4-9.06 What is the pH of a solution with 0.00300 moles of TRIS with dissolved in !50.00 mls of water? Calculate the pH upon addition of 15, 30 and 35 mls of 0.100 M HCl. 1:0 Here we will consider some reactions of a weak acid (HA) and a weak base (in this case, the conjugate of A). Recall that in water acids and bases undergo the following reactions: HA + H20 H30 A A H20 OH HA and dot 1) Write expressions for Ka and Kb. DHA 2) Write a balanced equation for the reaction of a weak acid (HA) with a strong base, OH-. (From, for example NAOH, which dissociates completely to OH in solution). Write an expression for Keq. Do you expect Keq to be small or large for this reaction? 3) Write a balanced equation for the reaction of a weak base (A) with a strong acid, H+, (From, for example, HCl which dissociates completely to H* in solution). Write a balanced equation for this reaction. Do you expect Keq to be small or large for this reaction? HO C 1Ue 4) How do your Keq for each reaction compare to your expressions for Ka and Kb? :
Chemistry
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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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Transcribed Image Text:Consider the titration of TRIS, a weak base, as you carried out in lab. The conjugate acid of TRIS, TRISH
has a pKa 8.06.
Dut
What is the pKb of TRIS?
i4-9.06
What is the pH of a solution with 0.00300 moles of TRIS with dissolved in !50.00 mls of water?
Calculate the pH upon addition of 15, 30 and 35 mls of 0.100 M HCl.
1:0
Transcribed Image Text:Here we will consider some reactions of a weak acid (HA) and a weak base (in this case, the conjugate
of A). Recall that in water acids and bases undergo the following reactions:
HA + H20 H30 A
A H20 OH HA
and
dot
1) Write expressions for Ka and Kb.
DHA
2) Write a balanced equation for the reaction of a weak acid (HA) with a strong base, OH-.
(From, for example NAOH, which dissociates completely to OH in solution). Write an
expression for Keq. Do you expect Keq to be small or large for this reaction?
3) Write a balanced equation for the reaction of a weak base (A) with a strong acid, H+, (From,
for example, HCl which dissociates completely to H* in solution). Write a balanced equation for
this reaction. Do you expect Keq to be small or large for this reaction?
HO
C
1Ue
4) How do your Keq for each reaction compare to your expressions for Ka and Kb?
:
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