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Which Is the Best Appropriate Acid-Base Indicator to Use in the Titration

Question 108

Multiple Choice

Which is the best appropriate acid-base indicator to use in the titration of 0.100 molar HCl(aq) by 0.100 molar NaOH(aq) ? The NaOH(aq) is the titrant.


A) thymol blue, for which pKind = 8.8, also HInd is yellow and Ind- is blue
B) bromothymol blue, for which pKind = 6.8, also HInd is yellow and Ind- is blue
C) phenolphthalein, for which pKind = 9.1, also HInd is colorless and Ind- is pink
D) cresol red, for which pKind = 7.9, also HInd is yellow and Ind- is red
E) Any of these indicators will suffice for this titration of a strong acid by a strong base.

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