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Which of the following indicators would be most suitable for the titration of 0.10 M (CH3)3N...

Which of the following indicators would be most suitable for the titration of 0.10 M (CH3)3N (Kb = 6.5×10−5) with 0.10 M HCl? Transition ranges in pH units are given in parentheses after the indicator name.
1. thymol blue (1.2 - 2.8)
2. alizarin yellow (10.1 - 12.0)
3. phenolphthalein (8.0 - 9.6)
4. bromocresol green (3.8 - 5.4)
5. chlorophenol red (4.8 - 6.4)
6. bromothymol blue (6.0 - 7.6)

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