Which Is the Best Colored Indicator to Use in the Titration

question 64

Multiple Choice

Which is the best colored indicator to use in the titration of 0.1 M CH₃CO₂H(aq) with NaOH(aq) ? Why? (K_a of CH₃CO₂H = 1.8 $\times$ 10^-5,K_b of CH₃CO₂^- = 5.6 $\times$ 10^-10)

• A) Bromcresol Green.The equivalence point for a weak acid titration occurs at low pH.
• B) Bromthymol Blue.The pH at the equivalence point is 7.0.
• C) Bromcresol Green.The pK_a of CH₃CO₂H and the pK_a of the indicator are similar.
• D) Phenolphthalein.The pK_a of CH₃CO₂^- and the pK_b of the indicator are similar.
• E) Phenolphthalein.The pH at the equivalence point is near the pK_a of the indicator.

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