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Indicator Selection
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Grade Level
Chemistry
11.108 Indicator Selection
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Phosphoric acid is titrated with NaOH. The first useful equivalence region is near pH 4.7, and the second is near pH 9.8. Which indicator is best for the first equivalence point?
A
Thymol blue, first range (transition pH 1.2-2.8)
B
Methyl red (transition pH 4.2-6.3)
C
Thymolphthalein (transition pH 9.3-10.5)
D
Alizarin yellow R (transition pH 10.1-12.0)
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