Consider an indicator (KHIn = 6.3 × 10-6) that ionizes as shown below. Which of the following statements is false?
HIn + H2O H3O+ + In-
yellow blue
a. The ionized form of the indicator results in a blue solution.
b. In acidic solutions containing the indicator, we would expect predominantly yellow color.
c. Adding a base to a solution containing this indicator will cause the color to become yellow.
d. At pH = 10.0, a solution of this indicator will be blue.
e. At pH = 3.0, most of the indicator is in the non-ionized form.
Answer: C