Consider an indicator that ionized as shown below for which its Ka = 1.0 x 10-4. HIn + H2O → H3O+ + In- yellow red Which of the responses contains all the true statements and no others? (1) The predominant color in its acid range is yellow. (2) In the middle of the pH range of its color change, a solution containing the indicator will probably be orange. (3) At pH = 7.00, a solution containing this indicator (and no other colored species) will be red. (Hint: Write the equilibrium constant expression for the indicator.)
Consider an indicator that ionized as shown below for which its Ka = 1.0 x 10-4.
HIn + H2O → H3O+ + In-
yellow red
Which of the responses contains all the true statements and no others?
(1) The predominant color in its acid range is yellow.
(2) In the middle of the pH range of its color change, a solution containing the indicator will probably be orange.
(3) At pH = 7.00, a solution containing this indicator (and no other colored species) will be red. (Hint: Write the equilibrium constant expression for the indicator.)
(4) At pH = 7.00, most of the indicator is in the un-ionized form.
(5) The pH at which the indicator changes color is pH = 4.
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