Which one of the following indicators would be best to use when titrating 0.1M morphine (Kb = 1.6 × 10-6) with 0.3M HCl? Thymol blue (pKa = 1.9) Phenol red (pKa = 7.1) Methyl red (pKa = 4.9) Thymolphthalein (pKa = 9.7) Chlorphenol red (pKa = 6.1)

Which one of the following indicators would be best to use when titrating 0.1M morphine (Kb = 1.6 × 10-6) with 0.3M HCl? Thymol blue (pKa = 1.9) Phenol red (pKa = 7.1) Methyl red (pKa = 4.9) Thymolphthalein (pKa = 9.7) Chlorphenol red (pKa = 6.1)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter5: Errors In Chemical Analyses

Section: Chapter Questions

Problem 5.10QAP

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Question

Which one of the following indicators would be best to use when titrating 0.1M morphine (K_b = 1.6 × 10^-6) with 0.3M HCl?

Thymol blue (pK_a = 1.9)

Phenol red (pK_a = 7.1)

Methyl red (pK_a = 4.9)

Thymolphthalein (pK_a = 9.7)

Chlorphenol red (pK_a = 6.1)

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