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 (K_a = 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)

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