Which of the Following Indicators Would Be Most Suitable for the Titration

question 266

Multiple Choice

Which of the following indicators would be most suitable for the titration of 0.10 M lactic acid with 0.10 M KOH(aq) ? For lactic acid, pK_a = 3.08.

• A) Methyl orange (pK_In = 3.4)
• B) Thymol blue (pK_In = 1.7)
• C) Alizarin yellow (pK_In = 11.2)
• D) Bromophenol blue (pK_In = 3.9)
• E) Phenol red (pK_In = 7.9)

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