Acid-Base Titrations

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Dhamnekar Winod
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Acid-Base Titrations

Post by Dhamnekar Winod »

The indicator dinitrophenol is an acid with a \(K_a \) of 1.1 × 10⁻⁴. In a 1.0 × 10⁻⁴ 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).
Last edited by Dhamnekar Winod on Fri Apr 30, 2021 12:30 am, edited 1 time in total.
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
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ChenBeier
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Re: Acid-Base Titrations

Post by ChenBeier »

What your ideas. What is the dissociation equation?
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Dhamnekar Winod
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Re: Acid-Base Titrations

Post by Dhamnekar Winod »

Actually i don't understand the meaning of 10% ionized (colorless) to 90% ionized(yellow).

I am working on this question. I want to read some chemistry articles on this topic and want to view some videos, if available on this topic.
Last edited by Dhamnekar Winod on Fri Apr 30, 2021 3:38 am, edited 1 time in total.
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
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Re: Acid-Base Titrations

Post by ChenBeier »

It means HInd. => H+ + Ind.- if 10% is on the right side its colourless, if the dissociation is 90 % then its yellow.
It is a change from 10 Ind.- to 90 HInd. to 90Ind.- to 10 HInd.

Develop K =
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