Based on the graph, what is the pKa of phenol red? 2) look up a reference value for pKa of phenol red (report value and citation). Calculate the % difference. ABF-0.8000CAbsorbance @ 556.7nm [A-]0.1260.1660.2320.2840.3830.463-0.6000D-0.40002.1322.7933.8844.7446.3807.702[HA]y = 1.0527x + 7.8121R² = 0.9912E-0.20007.8687.2076.1165.2563.6202.298PKa of Phenol Red at different pH8.68.48.248.7.67.47.2Flog([A]/[HA]) pH-0.5670-0.4116-0.1971-0.04450.24610.52540.0000log([A]/[HA])0.2000G24600007.27.47.67.888.4H0.400010.6000J

Given: A curve between pH v/s log[A-][HA].

Answered: Based on the graph, what is the pKa of…

Based on the graph, what is the pKa of phenol red? 2) look up a reference value for pKa of phenol red (report value and citation). Calculate the % difference.

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter9: Energy For Today

Section: Chapter Questions

Problem 9E

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

Based on the graph, what is the pKa of phenol red? 2) look up a reference value for pKa of phenol red (report value and citation). Calculate the % difference.

A
B
F
-0.8000
C
Absorbance @ 556.7nm [A-]
0.126
0.166
0.232
0.284
0.383
0.463
-0.6000
D
-0.4000
2.132
2.793
3.884
4.744
6.380
7.702
[HA]
y = 1.0527x + 7.8121
R² = 0.9912
E
-0.2000
7.868
7.207
6.116
5.256
3.620
2.298
PKa of Phenol Red at different pH
8.6
8.4
8.2
48.
7.6
7.4
7.2
F
log([A]/[HA]) pH
-0.5670
-0.4116
-0.1971
-0.0445
0.2461
0.5254
0.0000
log([A]/[HA])
0.2000
G
2460000
7.2
7.4
7.6
7.8
8
8.4
H
0.4000
1
0.6000
J

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