Which is the most appropriate acid-base indicator to use in the titration of 0.100 molar acetic acid(aq) by 0.100 molar NaOH(aq) ? This is the titration of a weak acid by a strong base.
A) phenol red, for which pKIn = 7.3; HInd is yellow and Ind- is red
B) bromothymol blue, for which pKIn = 6.8; HInd is yellow and Ind- is blue
C) phenolphthalein, for which pKIn = 9.1; HInd is colorless and Ind- is pink
D) cresol red, for which pKIn = 7.9; HInd is yellow and Ind- is red
E) All of the indicators listed will work equally well for the titration of a weak acid by a strong base.
Correct Answer:
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