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Assume an Indicator Works Best When the Equivalence Point of a Titration

Question 30

Multiple Choice

Assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range.Which indicator would be best for the following titration? 0.100 M HOCl (Ka = 3.5 ×\times 10-8) + 0.100 M NaOH


A) crystal violet (0.2 - 1.8)
B) phenolphthalien (8.2 - 10.0)
C) methyl orange (3.2 - 4.4)
D) thymolphthalein (9.5 - 10.5)
E) cresol red (7.0 - 8.8)

Correct Answer:

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