You Analyze for Pyridine (K_b Is Approximately 10^-9) by Dissolving

question 39

Multiple Choice

You analyze for pyridine (K_b is approximately 10^-9) by dissolving 0.1000 g of the complex in 100 mL of H₂O and titrating with a 0.01 M HCl solution. Which of the following indicators should be used to detect the endpoint? (Assume that the initial concentration of pyridine is approximately 0.01 M.)

• A) thymol blue, pH range of color change = 8.0-9.6
• B) methyl red, pH range of color change = 4.8-6.0
• C) bromophenol blue, pH range of color change = 3.0-4.6
• D) bromothymol blue, pH range of color change = 6.0-7.6
• E) alizarin yellow, pH range of color change = 10.1-12.0

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