(1) Setup the Ka expression
(2) Plugging in the values of concentration to the Ka expression:
At 10% dissociation:
1x1x10-4 (0.10) = 1.1x10-5
At 90% dissociation:
1x1x10-4 (0.90) = 9x10-5
Calculating H3O+ for both dissociation:
The indicator dinitrophenol is an acid with a Ka of 1.1 × 10 −4. In a 1.0 × 10 −4-M solution, it is colorless in acid and yellow in base. Calculate the pH range over which it goes from 10% ionized (colorless) to 90% ionized (yellow).
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Our tutors have indicated that to solve this problem you will need to apply the Acid Base Indicators concept. If you need more Acid Base Indicators practice, you can also practice Acid Base Indicators practice problems.
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Our data indicates that this problem or a close variation was asked in Chemistry - OpenStax 2015th Edition. You can also practice Chemistry - OpenStax 2015th Edition practice problems.