Consider a pH titration curve at 298 K for 50 mL of 0.10 M hypobromous acid, HBrO (Ka = 2.8 x 10−9), titrated with 0.10 M KOH solution. a. What volume of KOH is needed to reach the half-equivalence point? b. Calculate the pH of the HBrO sample at the half-equivalence point. c. Calculate the equivalence point pH. d. Identify a satisfactory pH indicator for the equivalence point. The pH range of colour change is indicated in parentheses. A) Methyl orange (3.0 - 4.3) B) Bromocresol purple (5.0 - 6.5) C) Alizarin yellow R (10.0 - 12.0) D) Methyl red (4.2 - 6.2)
Consider a pH titration curve at 298 K for 50 mL of 0.10 M hypobromous acid, HBrO (Ka = 2.8 x 10−9), titrated with 0.10 M KOH solution. a. What volume of KOH is needed to reach the half-equivalence point? b. Calculate the pH of the HBrO sample at the half-equivalence point. c. Calculate the equivalence point pH. d. Identify a satisfactory pH indicator for the equivalence point. The pH range of colour change is indicated in parentheses. A) Methyl orange (3.0 - 4.3) B) Bromocresol purple (5.0 - 6.5) C) Alizarin yellow R (10.0 - 12.0) D) Methyl red (4.2 - 6.2)
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Consider a pH titration curve at 298 K for 50 mL of 0.10 M hypobromous acid, HBrO (Ka = 2.8 x 10−9), titrated with 0.10 M KOH solution.
a. What volume of KOH is needed to reach the half-equivalence point?
b. Calculate the pH of the HBrO sample at the half-equivalence point.
c. Calculate the equivalence point pH.
d. Identify a satisfactory pH indicator for the equivalence point. The pH range of colour change is indicated in parentheses.
A) Methyl orange (3.0 - 4.3)
B) Bromocresol purple (5.0 - 6.5)
C) Alizarin yellow R (10.0 - 12.0)
D) Methyl red (4.2 - 6.2)
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