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Get Full Access to Organic Chemistry - 8 Edition - Chapter 15 - Problem 23p
Get Full Access to Organic Chemistry - 8 Edition - Chapter 15 - Problem 23p

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# Phenolphthalein is an acid–base indicator that is

ISBN: 9780321768414 33

## Solution for problem 23P Chapter 15

Organic Chemistry | 8th Edition

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Problem 23P

Phenolphthalein is an acid–base indicator that is colorless below $$p H 8$$  and red above $$p H 8$$ Explain briefly why the first structure is colorless and the second structure is colored.

Equation Transcription:

Text Transcription:

pH 8

pH 8

OH

OH

HO-

OH

Step-by-Step Solution:

Solution:

Here we have to explain why phenolphthalein of pH<8 is colorless and pH >8 is red.

Step 1

In the compound A, the central C-atom is sp3, hybridized and this carbon atom is attached to the lactone ring oxygen. Due to the lack of delocalization in the molecule , it is colour less in acidic medium.

Step 2 of 2