Which one of the following indicators is best suited for titrating 0.40 M ammonia (pKb = 4.74) with 0.40 M HCl? A. Alizarin yellow, pKa = 11.2 B. Phenol red, pKa = 7.9 C. Bromocresol purple, pKa = 6.3 D. Methyl red, pKa = 5.0 E. Bromophenol blue, pKa = 3.9

Which one of the following indicators is best suited for titrating 0.40 M ammonia (pKb = 4.74) with 0.40 M HCl? A. Alizarin yellow, pKa = 11.2 B. Phenol red, pKa = 7.9 C. Bromocresol purple, pKa = 6.3 D. Methyl red, pKa = 5.0 E. Bromophenol blue, pKa = 3.9

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 12.97PAE

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Precipitation Titration

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Question

Which one of the following indicators is best suited for titrating 0.40 M ammonia (pK_b = 4.74) with 0.40 M HCl?

A.
Alizarin yellow, pK_a = 11.2
B.
Phenol red, pK_a = 7.9
C.
Bromocresol purple, pK_a = 6.3
D.
Methyl red, pK_a = 5.0
E.
Bromophenol blue, pK_a = 3.9

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