Which of the pH indicators from the list above would be most appropriate for the titration of 0.30 M acetic acid (Ka = 1.8 × 10^-5) with 0.15 M sodium hydroxide? A) methyl orange B) litmus C) thymol blue D) trinitrobenzene E) Both thymol blue and litmus can be used.

Question

Quizplus · Accepted Answer

Thymol blue has a pH range of 8.0-9.6, which is suitable for the titration of a weak acid (acetic acid) with a strong base (sodium hydroxide). Methyl orange and litmus have a lower pH range and would not change color in the pH range of this titration. Trinitrobenzene is not a pH indicator.

Which of the PH Indicators from the List Above Would