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Which Is the Best Colored Indicator to Use in the Titration

Question 52

Multiple Choice

Which is the best colored indicator to use in the titration of 0.1 M CH3CO2H(aq) with NaOH(aq) ? Why? (Ka of CH3CO2H = 1.8 ×\times 10-5,Kb of CH3CO2- = 5.6 ×\times 10-10)
 Which is the best colored indicator to use in the titration of 0.1 M CH<sub>3</sub>CO<sub>2</sub>H(aq) with NaOH(aq) ? Why? (K<sub>a</sub> of CH<sub>3</sub>CO<sub>2</sub>H = 1.8  \times  10<sup>-5</sup>,K<sub>b</sub> of CH<sub>3</sub>CO<sub>2</sub><sup>-</sup> = 5.6  \times  10<sup>-10</sup>)     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<sub>a</sub> of CH<sub>3</sub>CO<sub>2</sub>H and the pK<sub>a</sub> of the indicator are similar. D)  Phenolphthalein.The pK<sub>a</sub> of CH<sub>3</sub>CO<sub>2</sub><sup>-</sup> and the pK<sub>b</sub> of the indicator are similar. E)  Phenolphthalein.The pH at the equivalence point is near the pK<sub>a</sub> of the indicator.


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 pKa of CH3CO2H and the pKa of the indicator are similar.
D) Phenolphthalein.The pKa of CH3CO2- and the pKb of the indicator are similar.
E) Phenolphthalein.The pH at the equivalence point is near the pKa of the indicator.

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